A woman who is great to look at, but dangerous to get close too.
"She's hot! Too bad she's a jellyfish... That girl is crazy as hell, she'll stab you during foreplay..."
by DaRealMan March 13, 2013
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A Jellyfish is what you make when you wack off into a glass of water. The result is a partially floating, dangling, jizz strand that looks like a jellyfish.
"So did you hook up with whats-her-name last night?"

"No dude, I just went home and made a jellyfish."
by El Spicy Taco August 21, 2008
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A free-swimming, gelatinous, often bell-shaped creature with a basic nervous system and the ability to sting prey. (Sometimes confused with or sometimes seen as moon jelly.)

A weakling or someone who lacks strong character.

Apparently, several interesting euphemisms, all of which can be found right here.
"You're such a jellyfish," said my sister after I dropped my books for the third time and protested that they were heavy.
by tomato-greens December 7, 2005
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when you get drunk or high and float in a pool inside a ring float. u let your legs dangle underneath you like a jellyfish and u let your face lay restlessly on the float. if done right it is the most effortless thing you can do.. even more so than laying down
yo last night after we blazed we all went jellyfishing in the pool. it was just way too relaxing
by ddotr1988 June 23, 2011
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a successfully used condom filled with ejaculate
that was fun baby, let me throw away this jellyfish
by chasingorion February 3, 2010
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when you nut on a girls face and it looks like a jellyfish
Ben:Yo broskee, i totally was jellyfishing that girl last night.

John:Really! Me Too!
by R Dark Chocolate R January 30, 2010
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