An act of masturbation or wanking performed when your family/flatmates are out and you are at home alone, allowing you to knock one out without having to worry about getting caught, and enabling you to view pornography with the volume turned way up.
"Hey man, I'm having a party wank at my place tonight."

"Well make sure you check every room first."
by bloodmonkey October 15, 2008
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A wank just before you go to a party in the hope that you will end up sleeping with a girl and consequently you are on top form.
Dude 1: Im so glad i had that Pre party wank.

Dude 2: Whys that.

Dude 1: I beat my PB of 2 minutes!
by Rizzlemynizzleshizzle March 27, 2011
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