(n) moving your hand in a jellyfish movement on a man's package while trying to give him a handjob. something most little eighth grade girls do to their older boyfriends, for lack of knowledge how to give a real one.
Man 1: "Did you hear what Drew & Kelly did last night?"
Man 2: "Nahh what"
Man 1: "Kelly jellyfished him again"
Man 2: "Damn eighth graders don't know how to give a proper handjob"
To go in for a fist touch, but stopping midway, yelling "JELLYFISH!" and propell your hand backward like that of the movement of a jellyfish.
Other variations of this would be snowman, in which you place your fists ontop and bottom of the other persons fists, snail, in which you slide your hand onder theres with two fingers up, and turkey, where, during a high five, you but your thumb out and slam your fist into their palm so that it resembles a turkey.
A personwho is "jelly" or jealous. They are often found ridiculing other's acheivments.
Guy 1: Hey bro, check out my new rims.
Guy 2: They suck, man.
Guy 1: Wow, you really are a jellyfish.
Guy 2: I'm not a jellyfish!
Guy 1: Yes you are.
Guy 2: Am not.
Guy 1: Are to.
Guy 2: Am not.
Guy 1: Are to.
Guy 2: Okay.