A Water polo goalie who looks bad but is actually really good and appears out of nowhere when you shoot the ball, therefore "sinking" the other team's hopes of an easy win.
An iceburg is a female who has a skinny face but a fat body. She might look all hot riding in her car but once she gets out you realize that she is fat!
I saw the hottest girl driving a Mustang the other day so I motioned for her to follow me. When we got to a side street, we got out to talk and it turns out she was a total iceburg!