Noun;Human male ejaculate floating inside a public shower.
Hey bud, don't step on the endangered fresh water jellyfish swimming in the shower or you'll get a fine.
by jonny5000 June 5, 2009
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The male ejaculate left floating in the tub or shower following masturbation, resembling the marine invertebrate. Generally non-poisonous.
"Dude, go ahead and use my shower but I know you haven't been laid for a while. I better not find any fresh-water jellyfish in there later."

"I would never do such a thing, mate. I'm offended you would suggest it... Any baby oil in the medicine cabinet?"
by JT Amish December 15, 2009
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