A state of euphoria resembling a brainless underwater creature usually caused by drugs, music, alcohol, or some combination of all the above.

Man's greatest invention, brain bleach removes bad memories and general DO NOT WANT moments. Every household should have a few gallons.

A man that gets emotionally and mentally dominated by a girl. He is left empty and pathetic, like the common jellyfish.

wet cum. When semen gets in water such as in a hot tub it becomes hard and looks like a jellyfish.

A kind of faux five when you're going in to give someone a high five but quickly pull away, making your hand make jellyfish motions in the air while saying, "JELLYFISH!"
To add to the affect, apologize, then go in for a hug.
When they go in for the hug also, pull back and make the jellyfish motions with your arms while saying, "JELLYFISH!"

Known to be annoying as hell.

a guys load left on the shower floor.

A free-swimming aquatic creature. It starts life as a larva, which attatches itself to a rock or other solid substance and develops into a polyp; eventually the polyp grows into the familiar bell-shaped organism.

Most jellyfish have tentacles and a basic nervous system, though they lack more complicated organs, and they are allegedly composed of about 95% water. They usually catch their prey by brushing potential victims with their poison-spouting, long tentacles, which can be anywhere from inches to several feet long.

Pl. jellyfish

Slang: various sex acts.