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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A term used to describe ones mother impliying that they have a lot of pubes. Can be used as a come-back if someone says you have a mulle..