When your and some other people are riding your skate boards and one of them accidently gets too close behind you and hits you with their board.
Usually knocking you off balance, causing you to wipe out.
Rob: Dude I was riding with kevin the other day looking for a sweet spot and I totally got a shark bite from him.
Ryan:What happened dude?
Rob: I wiped out, i left some skin o nthe road.