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1 definition by Smilikymeat

A harmless prank where one flaps the palm of their hand side to side, like a salmon, against the insides of another persons thighs from behind. The higher up the thigh, the dirtier the dirty salmon.
Dude, can you believe he just dirty salmoned the mormon chick?

Yeah man, I think he's going to go to jail.
by Smilikymeat April 10, 2011