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Ejaculation as a result of a nearby friend having intercourse in a body of fresh water, with or without you knowing.
Hey bro I just got stung by your freshwater jellyfish.

While enjoying an afternoon swim in Lake Shasta, out of no where this freshwater jellyfish snuck up on me and stung me right in the face.
by Captain boathouse July 26, 2012
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jizzum jellyfish

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After having sex in a swimming pool, you pull out, leaving a cloud of jizzum resembling a jellyfish.
"When I came out of the water, I had Justin's jizzum jellyfish on my face."
by Uncle Jerry Sandusky June 5, 2014
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Jamestown Jellyfish

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Having a roommate sucks, and thus the Jamestown Jellyfish is a pleasurable way to leave a vengeful treat for your unsuspecting roommate. All you need is a shower and your hand. When your roommate won't leave the house, but you have the desire to rub one out, get in the shower, jerk off, and blow a load in the floor of the shower. Immediately shut off the water so the jellyfish does not disappear down the drain. The next time your roommate goes to take a shower he/she will find your special marmalade lurking in the tub.
Dude, I need to jerk off and my roommate won't leave, so I went into the shower and left a Jamestown Jellyfish for him on the shower floor. He stepped in my gelatin the next day--that will fix his wagon!
by anonymous March 5, 2022
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dropping jellyfish

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a dude masturbating in the shower; the semen fallen to the water soaked floor look like little jellyfish swimmin' around.
"I was dropping jellyfish so much last night my bathroom is its own underwater ecosystem."

most obvious when water level is at least an inch, and your face happens to be down close enough to the floor.. also exemplified by liquid soap squirted into a basin of water.
by gabilanwings December 9, 2008
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A member of the Republican Party who fails to support traditional conservative values in an attempt to appease his or her moderate-to-left constituents. A play on Yellow Dog Democrats, this term was chosen because gray represents neutrality and jellyfish are spineless. Coined by ar15.com user PBIR November 07, 2008
"There's no way that gray jellyfish Republican will support our 2nd Amendment rights, he's from a moderate sector of Florida."
by PBIR December 9, 2008
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The jellyfish

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When a man ejaculates into his hand, then spreads his semen on his shlong, he then dips it in a glass of salt water, and proceeds to urinate in the glass, and a woman drinks the contents of the glass, leaving her with a sting in her throat
Man, this girl as a freak! She asked me to make her The jellyfish
by FatXenomorph December 6, 2019
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To have ADHD, ADD or any other form of not being able to pay attention. Someone so distracted that the most random, unimportant thing could occur and they'd go AFK.
*Conversation happening*
"What do you think, Mark?"
*Silence*
Kane: Oh, he went brb jellyfish.
*Two hours later*
Mark: I'm back guise, I have cheesey chicken
by StephanieQ January 23, 2009
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