What is Knuckle Butter?
1.
Noun, the slimy substance that seeps out from between the fingers of a closed fist after a person has ejaculated in their own hand.
Jack used a tissue to wipe the knuckle butter off of his hand after he jacked off.
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The girl you need to fuck after a whole night of hard sex.
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The state of sexual climatica as a result of sexual erotica. I know, go fig.
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