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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
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2
The act of putting a live salmon down the back of someone's pants, then yelling "SNEAKY SALMON SNEAKY SALMON" and dancing as they struggle. Yes, you will be held accountable if you are caught sneaky salmonning somebody.
"Wow did you see that guys face when I sneaky salmoned him"
"Yes, what a blast"
by DatAMAZEBALLSHippoYAR! May 13, 2017
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3
The action of sneaking up behind an unsuspecting individual and then inserting one hand between that person's knees and then slapping the insides of their legs while traveling upwards, mimicking a salmon swimming upstream.
Hey bro, can you video this dudes face while I dish him up a sneaky salmon.
by Fat2Flat April 23, 2017
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