N: One who randomly strikes people in the testicles. Often on a daily or hourly basis.
Billy is a cock knocker. He hit me in the balls everyday this week.
by Alex December 5, 2003
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one who llikes to go cock-knockin' ie, a male who prefers cock to pussy
or, in jest, a way of calling your friend an asshole
that guy's a total cock-knocker

man, you cock-knocker! where'd you score THAT? that shit is PROPERTY, man!
by celestia March 14, 2003
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An individual who exudes an aura of extreme fuckwittery!
Bruce is a right Cock Knocker!!

Yeah what a fuckstick!
by Maverick 293 October 24, 2009
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1.One who punches a man's balls

2. An evil villain in Jay and Silent Bob Strike Back

3. Also see Mark Hamill
by James Lowe July 15, 2005
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noun.
A gentleman who bangs at the back door
See that Elton John, he's a right cock-knocker.
by Kev December 10, 2002
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1. A person, usually a male homosexual, who grabs or brushes up against the genitalia of men, in a playful or sexual way.

2. A woman who pleasures a man with her knockers, usually followed by having him ejaculate on her breasts and/or face.
1. That guy Jay grabbed Brodie's and TS's cock in Mallrats. What a cock-knocker.

2. Did you see that porno where Savannah cock-knocked a guy and he came all over her tits?
by calweycn October 3, 2007
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