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To perform a toilet fuck: Find a girl who is drunk, being sick into a toilet, pull her trousers down/skirt up and fuck her from behind. When finished walk away like nothing happened. Shes too drunk to remember.

A girl who is "a toilet fuck" is someone you would only fuck in this scenario.
"Do you think sarahs hot ?"
"mehh, sarahs a toilet fuck."
by albrechtdurer March 22, 2009