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1. When you are having sexual relations with a member of the same or opposite sex and you ejaculate on their ass and slap it, on the ejaculate, when you are done.

2. Buttering someone's pan is slapping their ass after you cum on it.
"I was going to be a gentleman and take her to brunch after that drunken one night stand but I ended up buttering the pan instead."

"Dude, you buttered her pan!? I hope you washed your hand before making those cookies!"
by PashPartake January 18, 2012
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