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!
by Jellyfishers unanimous. November 14, 2009
when a woman realises she has crapped her pants (underwear) she then begins to do what is known as "jellyfishing" this is where she crosses her legs in a tight bow, lowers the stereotypical 1960s long skirt she is wearing and scoops the mess into her handbag, she then flings the handbag into the nearest ocean and jellyfish (confused and aroused) swarm the handbag and are momenteraly dissapointed.
Gregory : GOOD GOD!
Stanley : What is it man?
Gregory : That woman just shat in her purse!
Wilma : its a classic case of jellyfishing that is.
x
by The Columbus Project July 22, 2009
Finding a girl or guy with "dat ass" and smacking it.
Two guys are walkin down the street and a woman wit a fine ass.
First guy smacks the woman's ass and then walks away while the woman grabs her ass. "Jellyfishing!"
Second guy, "Why'd you call it jellyfishin'?"
First guy, "Cuz it jiggles and it stings!"
by awakener71 March 02, 2015

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