the act of sneaking up behind someone and moving your hand quickly back and forth between their knees, making the victim believe there is a fish between their legs.
The victim is at first overcome by confusion, which results generally in a high leaping motion followed by anger and rage once they realize what has happened.
person1: should I sneak up on joe and trout him?
*sneak and trout*
joe: STOP TROUTING ME
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