jello-like organism with no heart and no brain.

see <i><b>boy</i></b>,
So what happened with tht guy you were seeing?
- He turned out to be a total jellyfish
by FOC March 15, 2006
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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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Jellyfish backbone is a person who says one thing but does the opposite and blames others.
My boss has a Jellyfish backbone.
She speaks of standards and holding employees accountable for results. But, every time she has the chance to prove her statement she makes excuses and does nothing.
by Mr. Harrahs February 26, 2014
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A super colorful song about a breakfast food that only takes 3 microwave minutes. It's by Gorillaz, and Features De La Soul and Gruff Rhys. By the time this song is over your Superfast Jellyfish should be delicious and pipping hot.
Dude 1: Man, I have to wait 3 whole minutes for my shit to be ready!
Dude 2: Let's just listen to Superfast Jellyfish
Dude 1: HELL YEAH!
by VoltFlare June 12, 2010
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When you masterbate into your hand and then slap somebody's face.
Steven had to jellyfish slap Trevor for sleeping on the train.
by Drdog March 6, 2014
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A circular gelatinous blob of santorum that may form on a surface after being expelled from the body.
I accidentally slipped out of my girlfriend last night while we were doing anal and she gave birth to a santorum jellyfish right there on the sheets. It was a very quick labor.
by mrcyn November 20, 2013
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A woman with an extremely dangly clitoris.
Damn dude her clits that messy it looks like she's smuggling a jellyfish
by misshandy February 10, 2015
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