When your friend offers up his fist to pound, and in return you put your flat hand under it and start wiggling it around saying snail. Also a way of telling the world you have no life.
Guy 1: Dude! I can't believe you tapped that chick! Pound it!
Guy 2: (after he fist pound 2 snail's his friend) SNAILED!
Guy 1: Wow...I now have no respect for you.