term used to describe someone who is both mad and jealous. also means this person is very jealous. derived from the term 'u mad?' in which later the term 'u jelly?' came about.
Dude 1: "Sup bro. I'm fucking your girl. U mad?"

Dude 2: "Yeah I'm mad you little prick."

Dude 1: "U jelly?"

Dude 2: "Fuck you."

Dude 3: "Oh he mad jelly."

Dude 1: "Yeah. He mad jelly."
by therealboy November 15, 2010
Meaning mad jealous. When someone is very jealous they are mad jelly.
I'm mad jelly of Shay's anonymity right now.
by emmylemmyhead November 14, 2010
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