An acronym for the phrase "Y"ou're "J"ust "J"ealous. It is used for text messages, emails, Blackberry Messaging, Carrier Pigeon Messages, Morse Code, smoke signals or any other non-verbal communication with someone that has been telling you nothing but hater like comments to you that don't really affect your awesomeness because you know that deep down inside, they really are just jealous!
Also see: "You're Just Jealous!"
I CANT BLIEVE U
OMG YJJ LOL