Top Definition
Whenever butter is used as lubricant. Most likely comes from the film, "Last Tango In Paris," where two characters are having anal sex, and the man uses butter as lubricant.
~Man 1~ Man, I ran out of vaseline last night, so me and Sandy just used butterlube.

~Man 2~ Is a trip to the store that hard?
by Butterlube November 04, 2007
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