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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
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