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U Jelly is a phrase/meme used on forums, most commonly 4chan, to ask a person if they are jealous. It's usually accompanied by a picture of a guy with a smug smirk, with 'U Jelly?" Over his head.

It's used to ask forum goers are they jealous, because someone on the forum has something that others don't have, and they want to show it off, to make other people Jelly.
Anonymous: I just got this limited edition version or Radiohead's, Kid A on vinyl, U Jelly?

Anonymous 2: Yes I very much am Jelly!
by RolphSemensDickOvensUWIDI October 10, 2010
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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2
U Jelly? is an online catchphrase used as a shorthand for โ€œyou jealous?โ€, an inflammatory remark typically interpreted as a form of trolling in discussions and comments.

Similar to "U MAD, the phrase is typically said in a boastful manner to cause annoyance. On imageboards, the expression is often accompanied by a cartoon character wearing a smirk.
2400 out of 2400 on sat, u jelly?

Lvl 100 in lol, u jelly?
by u jelly noob! February 20, 2012
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