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To successfully masturbate and cum in under a minute. Also known as "Power Shwack". Commonly done in Stripper booths (see Lusty Lady) and friends/relatives bathrooms while visiting. The power swack has been gaining mass popularity on the internet on sites such as chat roulette and various other webcam or social networking sites.
Power Swacking has also become a popular game amongst college students. Where several students will gather around trying to achieve orgasm before the competitor.
Tyler Hey, the peep show cafe has dollar booths.

Daniel What?!! I might have to go power swack before work.

Garett fags disgust me.
by [Strider] April 12, 2010
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