when you use your penis like a knife and scoop some butter with it then smear it on someone's anus and then have anal sex with that person useing the butter as a lube.
Doug went out with Smeegal last evening and he said that he was butter in the buns before they went out for dinner and a romantic movie.
by mongolian mantis May 3, 2009
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v. When you crap your pants but just enough to get the cheeks wet.
Johnny: Uh-oh, I think I just crapped my pants...(upon inspection)nope...just buttered the buns. Can I borrow some boxers?
by camino83 November 23, 2013
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Expression Related to Cheese and crackers of oh my god
Person 1: My Sister Just Finished 1 Grade

Person 2: Well Butter My Buns Congratulation's
by Expersions April 18, 2016
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The private parts of a woman who has already had sexual intercourse with someone else
I had sex with Mary after the party, but I don't normally want a buttered bun.
by Tom June 6, 2003
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Rolling back to the 1970's joy of sex book,a buttered bun is the highest bond between two male friends. To have sex with a woman, cum inside her, and have the other male have sex with her right after him and let his cum get all over his penis.
Oh, here man, I got this woman all buttered up for ya...
by bonneville babe February 8, 2005
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aka sloppy seconds. Though this one goes back a few hundred more years.
by Brian X June 24, 2003
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