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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When you cum on someone’s ass and it covered their ass.
“MAN I REALLY BUTTERED HER BUNS.”

“HER BUNS WERE BUTTERED.”
“You can say I had Buttered Buns.”
by Justasin September 18, 2022
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