butt swill 

The last inch of booze in a bottle that has been passed around and drank from by several people.

Only the last half-inch of whiskey remained in the 1.75, but John drained the remaining butt swill with a grin of pleasure.

butt swill by chahuggy August 3, 2014

Buttwilly 

When someone sticks their finger down the crack of their butt and then swipes it across someones nose. Same technique as a wet willy. Pronounced But-twilly.

I gave Ty a buttwilly today after working out, I bet he can still smell it!

Buttwilly by Amazoncountry November 9, 2011

Buttsville 

An area in Dungeons and Dragons where the party decides to go rather than the obvious story related place.

Lucius: "Hey lets travel to Buttsville instead of The Kingdom of the Ice Dwarfs!"
Dungeon Master: *Groans*

Buttsville by DieCheese March 7, 2019