look up anything, like your first name:
1. Pre Shag Wank
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.
rss and gcal