when you stick a penis (or dildo) up someones ass for your sexual pleasure. this happens a lot with queers. but a man could stick his weiner in a womens ass or a women could stick a dildo up another mans ass. there are endless possibilities
me and your wife were buttfucking last night and thats why theres a white spot in her ass.
A term used to describe an incredibly ugly person; someone you'd have to turn around to fuck. For people who aren't into anal, this is somewhat drastic.
Can also be shortened to "butt fugly".
Robin: Dude, look at the chick! She's so butt-fucking ugly!
Oliver: I dunno, man, I think I'd just paper bag her.
James: Hey, fuck off, dude! That's my sister!
Oliver: Family resemblance, eh?
another term for a station wagon, mini-van, or any other kind of vehicle that is targeted at the "family" demographic(also M.A.V.)
"Tactical advantages aside, the M.A.V. is top of the line for the holy warrior troop transport manufactured by the Church of Latter Day Saints Military Industrial Complex. Also great for family trips...to heathen lands."