It's when after someone takes a shower, they stop the drain and leave a little water left in the tub. Then they ejaculate in the small pool and leave the "jellyfish" there for the next person/roommate to discover.
you live in an apartment, dorm, or house - where a bathroom is shared. the Jellyfish is at the next level of disgusting pranks!
by Trivial Pursuer December 21, 2010
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wet cum. When semen gets in water such as in a hot tub it becomes hard and looks like a jellyfish.
I jacked in the shower and left a jellyfish sitting in the drain.
by Libraryguy July 28, 2009
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To be covered in a multitude of hickies several of which appear to lead in rows from one part of the body to another and resembling a sting track caused by the tentacles of a jellyfish.
Did you see the number of hickies going all the way down her neck? She was jellyfished!
by Greenman88 August 12, 2009
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A kind of faux five when you're going in to give someone a high five but quickly pull away, making your hand make jellyfish motions in the air while saying, "JELLYFISH!"
To add to the affect, apologize, then go in for a hug.
When they go in for the hug also, pull back and make the jellyfish motions with your arms while saying, "JELLYFISH!"

Known to be annoying as hell.
Kaitie: OMG! Highfive!
Courtiney: JELLYFISH!
Kaitie: ))):
by ROFLMAOWOTLK November 13, 2008
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An asshole fish that will kill you if you touch it.
Person swimming: oooo jellyfish
Person swimming: Ima touch it
De jellyfish: *sting* *zap* *kill*
Person swimming: *dead*
De jellyfish: hehehe he dead
by Josie :P August 15, 2013
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Someone who has no spine, no balls. A person who never stands up for themselves or anyone else. Someone who would never admit to any wrong doing.
I cannot believe that guy, he's such a jellyfish.
by Bacita Mae Jenkins April 4, 2020
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Verb-- The act if becomming so unbelievably drunk that your body takes on traits of a jellyfish. You have no brain, bones, eyes, or clue where you are or what you're doing.
Scott: "Holy shit what the hell happened last night? I don't remember leaving the bar!"

Amy Jo: "Yeah bud you were jellyfishing hardcore! We just sat across the bar and laughed at you."
by sbaue September 27, 2013
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