Top Definition
a girl with braces who sucks at giving head.
My ex-girlfriend was a cock killer.
by sergeant sweetpants & uncle remis January 18, 2007
1 more definition
A vagina so rough, wild, and relentless in the goal of achieving an orgasm in the bedroom that ultimately results in penile breakage.
After his "injury" caused by Rihanna's overzealous romantic escapades, Peter banished her from his fuckbook account as a certified cock killer and ended up never fornicating with her again.
by NorthernExposurePole February 21, 2015

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