The oily, smelly residue that is a result of the accumulation of sweat, dirt, and left behind stuff between your ass cheeks after a long run or other sweaty physical training session.
My underwear was full of jockey butter after running a half-marathon.
I can't believe it's not jockey butter!
I can't believe it's not jockey butter!
by gooty2 January 22, 2010
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