Top Definition
The act of masterbating in secret without anybody noticing. Usually done behind a bush or whilst peering through a gap in the blinds, looking directly at the subject of your filthy attention. A real art when perfected.
I saw a cracking looking girl on the sidewalk outside my house yesterday and couldn't resist knocking off a crafty wank from my bedroom as she stood there!
by Nigel Fleming July 13, 2006
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