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?
New boyfriend: U JELLY BRO?
by RedReplicant October 27, 2010
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