This is when you take a small trash bag and place it over your partner's head when you're taking her from behind, then you close off the bag around her neck as you pull out of her vagina and go balls deep into her anus, she will expel an enormous amount of air to inflate the trash bag to resemble a Jelly Fish.
Dude, I went so far in her, so fast, she inflated the bag and looked like the Man-a-War Jelly Fish
Function: adjective, 1 : lacking mental strength: as a; deficiency in the spinal unit that creates physical vigor which results in being as FEEBLE as possible in a time when having balls is required. 2: Not able to sustain or exert much weight, pressure, or strain in the weight room, not able to take external force or withstand verbal attack.
"... we could have used Bob in the fight, but he just turned into a jelly fish before our very eyes."
an animal that is so damn annoying. when your in the waterswimming, oh hello there human! let me give you 5 big red lines behind your back! the brainless creatures are useless and they aren't meant to be on the earth!
damn it! a man o war jelly fish just stung the crap out of me!