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1.
After performing anal intercourse, ejaculating over the buttocks.
"I was riding her rump last night, and as soon as I came, I buttered her biscuits good"!
by 2slick2pretty July 25, 2003
 
2.
a guy cumming on a girls boobs
imma butter your biscuits
by saxfreak3 May 07, 2010
 
3.
term use in online video games after killing one or several people.
they just got thier biscuits buttered! i just butter your biscuits! holy shit doug fuckin buttered my biscuit!
by Doug-eee February 14, 2006