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to use another to prevent someone you don't like getting some pussy.
"that dickhead, i'm gonna get his mate to prock block him"
by kakaBOOOOOOOOOOOM April 25, 2007
a cock block by proxy.

to cock block on behalf of a friend to maintain his anonymity.

"dude, some guy is hitting on that girl i like! i need you to prock block for me."
by newsgroup April 22, 2007