Function: adjective, 1 : lacking mental strength: as a; deficiency in the spinal unit that creates physical vigor which results in being as FEEBLE as possible in a time when having balls is required. 2: Not able to sustain or exert much weight, pressure, or strain in the weight room, not able to take external force or withstand verbal attack.
"... we could have used Bob in the fight, but he just turned into a jelly fish before our very eyes."
by TheSoapShow December 19, 2004

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A man that gets emotionally and mentally dominated by a girl. He is left empty and pathetic, like the common jellyfish.
"Hey, Jason's girl cheated on him and now he's acting like a complete retard saying he has nothing to live for, he's become a real jellyfish."
by Noah Vanderhoof June 06, 2006

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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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A term used by Singaporeans to describe someone who is a weakling—you are so mad at him that you want to slap him a few times for letting himself being bullied by assholes and bitches in the workplace.
A number of bosses abuse their staff, because they're such an awful lot of jellyfish, who refuse to fight back against those office tyrants.
by MathPlus October 10, 2016

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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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A state of euphoria resembling a brainless underwater creature usually caused by drugs, music, alcohol, or some combination of all the above.
Sheldon was so jellyfish that he passed out while standing at the EDM festival
by MalaysianSensation November 16, 2015

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An adult male who has kept his hair long despite the fact the hair on top is now missing, creating the appearance of a gelatinous marine animal.
That Steely Dan concert was jellyfish city.
by PBSPinchback February 13, 2009

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A free-swimming aquatic creature. It starts life as a larva, which attatches itself to a rock or other solid substance and develops into a polyp; eventually the polyp grows into the familiar bell-shaped organism.

Most jellyfish have tentacles and a basic nervous system, though they lack more complicated organs, and they are allegedly composed of about 95% water. They usually catch their prey by brushing potential victims with their poison-spouting, long tentacles, which can be anywhere from inches to several feet long.

Pl. jellyfish

Slang: various sex acts.
Sometimes, during low tide, one sees jellyfish lining the shores.
by tomato-greens January 13, 2006

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