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A penis that when erect, goes straight up against the persons body as if it has been "wrenched" up.
Ryan has to be careful not to cum on himself due to his wrencher.
by Gioni October 05, 2006
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2
Tosser, plays with himself.
aA complete waste of space
Look at that wrencher!

Are you having a wrench.
by Tucion September 05, 2003
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