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knuckle bust

When you forcfully insert your knuckle/s into a person or animal/s to make them "bust" also known as "cucummig like a fire hose"
Derek; Yo cody how was lana lastnight at the party.

Cody; dude you wont believe it I knuckle busted the shit out of her.

Derek; Did she cum like a fire hose?

Cody ; Yeah you fuck stick

Derek ; Fucking sweet bro

Both; Mutual High-Five
knuckle bust by DBodah November 18, 2016

buttknuckles 

Singular: Noun: hip bones that protrude like knuckles when a girl is bent over; Most apparent on skinny girls.
During doggie-style sex, a woman's buttknuckles can diminish the sexual experience.
buttknuckles by pullon7 February 4, 2010