A game not commonly played. The object is to not be the last person to say Jellyfish.
Someone shouts out 'jellyfish' and everyone has to say, 'jellyfish'. The last person to say this says 'I am not a jellyfish'.

Then everyone laughs at them.
David: "Jellyfish!"
Jake: "Jellyfish-"
Becki: "-jellyfish-"
Simon: "I am NOT, a jellyfish."
by Pseudonymrawr June 13, 2010

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Jellyfishes (jealous bishes) is a jealous person who appears to be attractive, even harmless but will sting you at the worst possible moment. They often pretend to be your friend but wish they were you and quietly can't stand you.
Attractive, successful person: I am so sick of you stank-azz Jellyfishes all in my business! Get a life! *evil stare*
by CeeBeezy February 26, 2010

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a successfully used condom filled with ejaculate
that was fun baby, let me throw away this jellyfish
by chasingorion February 02, 2010

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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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When a woman leaves a wad of toilet paper in the toilet and it has trapped air under it, giving it a slightly bulbous look.
Aw, bitch, can't you flush, I don't want to see your jellyfish.
by Poosie October 14, 2008

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Group of sober people who follow the String Cheese Incident. Like the Wharfrats to the Dead.
"Meet me at the Jellyfish meeting at set break"
by krash.burner January 28, 2008

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When a man and woman have sex in a pool and the man pulls out at the last second and shoots his "jellyfish" into the water. This can and should be enhanced by being performed at night in a pool with lights making the jellyfish glow. This move can also be performed with gay males, or even a solo male.
1. I came by your house last night to use your pool. I ended up giving your sister a jellyfish.

2. I jellyfished your sister.
by Captain J. Sizzle April 26, 2011

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