Fist fighting. Professional, Amateur or Street.
When two dudes get to jawing in the Club, then go outside...'bout to be some "bumping knuckles!"
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To snort a small amount of cocaine from the creases of your knuckle. Usually the most discreet way to snort in public (club, party, street) so that no one will suspect anything.
Ben: Did you see that chick knuckle bump?
Tice: I sure did.
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When you fist a loose bitch with a yeast infection.
Wallace- Dude, you took her home last night? She's a no-go with that YI.
Jones- Nah man. I was knuckle bumping the oatmeal all night.
Wallace- You're fucking sick.
When two bros go to knuckle bump each other and one has knowingly left ejaculation on his fist.
Ben: Hey brotha, whatโs up? *offers knuckle forth for knuckle bump*
Chad: no man, Iโm good, looks you got that mayonnaise knuckle bump thereโฆ