Top Definition
A masturbation session lasting no more than 5 minutes.
1. I was in a hurry for class at 9, so I had to have a power whack at 8:50.

2. Dude 1: Hey I'm gonna go take a power whack.

Dude 2: Don't mean power nap?

Dude 1: No, a power whack.
by Beardmon June 28, 2010
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