Top definition
the knuckle in your half-erect penis when bent backwards
I was about to bang this chick until she saw my cock knuck, instand deal breaker.

My grandma saw my cock knuck the other day...

In the morning I get a mean cock knuck.
by dem mooseknuckle boyz April 17, 2012
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Dirty Sanchez Plush

It does not matter how you do it. It's a Fecal Mustache.

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