YJJ means: It is an acronym that stands for “Y”ou’re”J”ust”ealous. This acronym is for texts, email, Blackberry Messaging and Carrier Pigeon Messages. It can also be used to send smoke signals, Morse Code or other nonverbal communications with people who have been making hater-like comments about you. You can also see “You’re just jealous”. (in Community Dictionary, added by Jazlynn Henderson)