The unfortunate side effect of spending time in a body of water (such as a pool or bath) after being on the receiving end of anal sex.
I went for a swim after getting bummed by several flamboyant gentlemen and to my astonishment I found I kept farting jellyfish.
by Jellyfish Duke September 10, 2019

by Montag14 September 15, 2013

When a man jizzes into any basin of water, such as a sink, toilet, shower, or bathtub, and the jizz coagulates into a cohesive, gelatinous mass floating underneath the water - the resulting load of semen resembles a jellyfish.
by ioctl April 6, 2016

by Niles Jones May 2, 2010

A person getting a BJ while jumping on a trampoline. The one giving the job gets his/her mouth full of saliva and penile fluids, and then drools it all over the male scrotum. When finished the flailing scrotum will resemble a rabid jellyfish.
Boy: Wow, grandma, that was a mean rabid jellyfish you gave me last night. It gave me so much duck butter it was hard to sleep.
Grandma: Just giving you a little taste of the 20s boy.
Grandma: Just giving you a little taste of the 20s boy.
by Phatty_Chatty March 3, 2008

A form of foreplay in which one gives the male partisipant head while tugging on his pubes (jellyfish tentacles) and licking his sac (the squishy part of the jellyfish)
Mark: Dude, my girlfriend gave me glorious head last night
Rob: Duuuuuude, did she finally agree to give you jellyfish sex?
Mark: Heck yes!
Rob: Duuuuuude, did she finally agree to give you jellyfish sex?
Mark: Heck yes!
by nOOms April 10, 2011

Ahhh shit, the other day I slipped on an urban jellyfish lying on my stoop and almost wrecked my new dunks. Then later I seen my two pit-bulls playing tug-o-war with the same jellyfish and it snapped, the jiz was all over their face.
by John Ryan April 22, 2006
