The art of giving someone the surprise feeling of a salmon swimming upstream rapidly between your legs.
Sneak up behind a person while they are standing up directly facing away from you and make sure they don;t know you are there. Take one hand, make it flat like a karate chop, and rapidly move your hand back and forth between the person's legs just above their knees. This provides a surprising sensation of what it would feel like to have a salmon trying to swim upstream between your legs. When the victim turns around surprised and doesn't know how to respond to such an odd thing; you say "You got salmoned!"