Throwing knuckleballs: code for camel toe
Normally used in a situation to warn a friend to dodge the possibility of having to get an eye full of camel toe. The name knuckleball refers to the resemblance of a camel toe and a the way a baseball players fingers look when throwing a knuckleball.
Scott: Watch out she's throwing knuckleballs

Tom: Thanks for the head's up
by Alphapyr0 January 15, 2014
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When you fist someone with your middle knuckle elevated. It could also mean fisting someone with your class ring on.
I couldn't sit right for 2 days because Tom gave me a Knoxville Knuckleball.
by Buttwipes October 14, 2020
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a large vagina with bulbous, darkened labia.
Wakefield was pitching for the Sox today and the knuckleball mitt Mirabelli was using to catch him reminded me of your mother's vagina.
by c. friday April 7, 2005
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