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n. describes the creamy mixture of fluids that sneak out of the anus after unprotected anal sex. The base mixture contains spooge and fecal matter. It may also contain rectal blood, lubricant, spit or any other liquid that may have been inserted. Makes a great combination and sauce for the Dirty Sanchez.
Buddy, I woke up this morning, scratched my ass, and found some fresh bung butter - did you harpoon my starfish last night?
by cookie1964 February 13, 2013
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That frothy mixture of lube and fecal matter that is a byproduct of anal sex. Also known as Santorum.
When Michele Bachmann's husband pulled his dick out of Rick Santorum's ass, it was covered with bung butter.
by PartyBoy1981 January 02, 2012
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