Top Definition
N.

1. penis pump
Dude, Jeff got a new cock vac today!
by Spittle Masta July 17, 2008
1 more definition
a cocksucker, a useless or shitty person
Donny, just change your name to cockvac so people won't be surprised when they first meet you.
by Hanz Von Steiner March 09, 2005

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