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N. mastubatory doppelganger / lookalike.

One who is a physical stand-in for a sexual fantasy - a lookalike that one can whack off to while maintaining a fantasy of the original. The doppelganger is an innocent victim of your chudding tempest, by the way.

That poor girl. If she only knew that you stumbled across a porn lookalike ...
I was browsing some porn on the weekend, and I came across a complete doppelwhacker for my hot guidance counselor. I squeezed one out in less than a minute.
by minmi June 08, 2011
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