For a male to masturbate whilst sitting on the toilet; just after he's used the toilet for a poo.
Person A: I had a Poo Wank last night.

Person B: I don't understand why you'd want to do it?

Person A: Well the hard part was already over, taking my pants down and stuff, so I thought I might as well.
by Joee Brownn May 3, 2011
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the wanking of poo usaully exercised by homosexuals or people with serious mentall retardations
hey look at that retard having a poo-wank

by o.b1000 November 1, 2007
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