Top Definition
The strategy a man undertakes to avoid being ahead of schedule.

AKA, Tactical wank.
Ginger: Where the hell is Dave?
Jono: Heckfire... I dunno... His new lady's staying over later, I guess he's having a pre shag wank.
Ginger: That explains it.
by tetsuo jones August 26, 2009
5 Words related to Pre Shag Wank

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