Definitions by Jellyfishers unanimous.

Jelly Fishing 

when a person is sagging and their crack is visible aka plumbers crack and a friend who simply cannot resist temptation sticks their finger in the crack and wiggles it around. originates from Sponge Bob

Jerry: Fine this is what jelly fishing is...

Amanda: Did you just stick ur finger in my crack??...

Patrick: Thats what she said! OH WASSUP!

Jelly Fishing by Jellyfishers unanimous. November 14, 2009