A nonsensical phrase used to accuse your friends/foes of being "jelly," i.e. jealous. Closely related to "U mad bro?"
Cee Lo: I see you driving 'round town with the girl I love and I'm like, FUCK YOU!
New boyfriend: U JELLY BRO?
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Rita: I got a new purse
Nita: :lol: it's out of fashion
Rita: U jelly gum?
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