"One True Pairing" ship:
Hrm. I have several, which comes from having several fandoms, both current and at one point in time. In no particular order: Buffy/Spike (Buffy); Joe/Norma (Sunset Boulevard); Betty/Daniel (Ugly Betty); Erik/Christine (Phantom); Jonathan/Maddy (Jonathan Creek); Seven/The Doctor (Voyager); Mulder/Scully (The X-Files); John/Aeryn (Farscape); Sam/Annie (Life on Mars); Jack/Elizabeth (Pirates of the Caribbean); not to mention probably countless others if I put any more thought into this, but I don't really want to spend all night trying to list them. ;)
"One True Threesome" ship:
The only one I can recall was Derek/Yvette/Karl from Most Haunted, but I try not to count that one because it's technically RP and up until MH I didn't go into that kind of thing. But yeah. Derek/Yvette/Karl ended up as my OT3 purely because I couldn't pick between Derek/Yvette (WRONG and more WRONG) and Yvette/Karl (who are teH cuteness), so I just... combined them. ;)
"One True Foursome" ship
I can honestly say I've never had one. Although I guess the Betty/Joe/Norma/Max relationship-type thing in Sunset Boulevard comes quite close, but then, where do we put Artie? :)
Most of my ships are, surprisingly, canon... Buffy/Spike, Mulder/Scully, Erik/Christine (in a way), John/Aeryn and Sam/Annie, to name a few. The others are ones which were almost canon but never quite made it. Er, see below...
"Not quite canon but should be" ship:
Jonathan/Maddy, Doc/Seven and Daniel/Betty. And Norma/Joe, of course, though I consider it mostly too confusing to fit into generic categories like this. It's non-canon-canon. :P The few moments we do get with these ships are what make them for me; the potential for something, even if we never get an outcome. If nothing else, it means a lot more wish-fulfilment fic, which is my favourite type.
"If this happens I'll stab my eyes out with a spork" ship:
It did happen, and it was called Seven/Chakotay. *blech*
"You are one sick bastard" ship:
Hm. Um. I don't think I have any. Except probably jestingly, in passing.
"I dabble a little" ship:
There are some 'ships which hit my radar but don't get beyond the "hm, that has potential" stage in my brain. For example, Scorpius/Sikozu and Jool/Crais (though the latter shared literally one scene together) are a couple of Farscape ships I sort of... attempted to dabble in a few times. Buffy/Giles is another, though it's not really a shipping 'ship, to be technical... I've been reading Gene/Alex (Ashes to Ashes) on FFN recently. Random movie 'ships hit me: Mongkut/Anna (Anna & the King) is another I've been reading. I've also dabbled periodically in Norma/Max and Xander/Andrew, amonst others. I dabble in slash in the sense that I can spot it, usually gleefully, without actually taking it any further...
"It's like a car crash" ship:
Buffy/Spike. The fandom was basically watching them destroy each other for a year, but was unable to tear its collective eyes away from the carnage.
"Tickles my fancy but not quite sold yet" ship:
Quite a few. Sam/Annie and Gene/Alex have piqued my interest but not to the point where I want to write fic about them. Although, given I've now started writing for Ugly Betty in addition to my other fandoms, I don't really need any more. :)
"Makes no canon sense but why they hell not" ship:
I'm pretty sure I've never had a not-making-canon-sense ship, because I try to make my ships fit canon. The closest I get to non-canon shipping is when it's almost canon - the characters have scenes together and there is obvious chemistry - and if a pair of characters have never interacted, I can't ship them. It's as simple as that.
"Everyone else loves it but I just don't feel it" ship:
Betty/Gio. It's better than Betty/Henry, but I'm just not seeing it, I'm afraid. Admittedly we are half a season behind the US so I've missed lots of Gio-based episodes, but still. It's Betty/Daniel or no-one. :P Also Buffy/Angel, but that's because I wandered into the series midway through season 2 and missed their developing relationship. It doesn't help that I prefer Angel as Angelus and find him much less whiny and irritating when he's not around Buffy. ;)
"When all is said and done" ship:
All of my OTPs, but especially Erik/Christine, Norma/Joe, Buffy/Spike, Jonathan/Maddy and Mulder/Scully. All of which I analysed in detail in my shipper post some years back. :)
"Guilty pleasure" ship:
Probably Gene/Alex, actually, as prior to Ashes to Ashes the fandom was predominantly Sam/Gene... so, Sam/Annie, also. Oh, and Anthony/Adam (or Felicia/Mitzi, if you prefer) from Priscilla. I've never gone so far as to find fic for it, but it makes me grin like an idiot every time. I made them into an LJ layout, at the very least. :D
"I can't believe I read it and liked it" ship:
Anti Norma/Joe, if that counts. I found this bloody marvellously written fanfic on FFN whch was pretty much the anti-standpoint on Norma/Joe and I couldn't help but love it, which really surprised me. But I think that's because with Norma/Joe you need the negative before you can consider the positive. DEAR GOD, I LOVE THIS SHIP.
Favourite older/younger ship:
"I could never abandon you" ship:
Mulder/Scully, if my reactions to the movie trailer were anything to go by. I've said it before - old ships die hard. This was the ship which defined my actually becoming a shipper (season 2, episode 12, "Irresistible" - I can remember it very clearly) and no matter how much older I get and how much my approach to fandom changes, Mulder/Scully can still reduce me to the squeeing fangirl I was at 16. That's got to be worth something.
Also: Norma/Joe and Erik/Christine, as they have both used up so much of my fandom energy.
Favourite devotion ship:
Erik/Christine. He kills people for her. That's devotion for you. ;)
Favourite never-met ship:
*giggling insanely at Eni's reply to this, and whole-heartedly agreeing* Giles from Buffy and Bernadette from Priscilla. Blame the Crossover of Doom. :P
Favourite abuse ship:
Favourite "Awwww!" ship:
Mulder/Scully, though there is the 10% of hysterical bouncing up and down in that, too. Also Daphne/Niles (Frasier) back in the day, because it was never a squeeful kind of 'ship, just a sort of subdued 'awww' kind of one.
If I wasn't so tired, I could probably go on and on and on about my 'ships, but I would be regurgitating stuff I spent a long time thinking about once before, despite the addition of a couple new fandoms. I really should get paid for this sort of thing. ;) A quid for every ship I spot before it happens or the rest of the fandom notices would have been a nice little earner by now, and God knows I'm an expert. :P