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The action of inserting one's hand into another person's armpit and rapidly wiggling as a salmon would wiggle it's tail when swimming. Simultaneously shout 'sneaky salmon' to notify the one who is being sneaky salmoned.
Dude I just sneaky salmoned the shit out of that girl's armpit.

Sneaky salmon, sneaky salmon bahahhaha!
by Shrimp Hands May 02, 2013