Demonstrates a feeling of great excitement/shock etc.
A variation of 'OMG' (oh my god) mainly used by tweenage girls and in relation to the Jonas Brothers.
The 'J' stands for 'JONAS' referring to the popular American Disney band who have been sneaking ever closer to world domination with such catchy pop-rock hits as 'BB GOOD' and 'LOVEBUG'.
This phrase is used both on and offline by Jonas Brothers fans worldwide.
Ex 1:
Girl 1: "I heard that Nick (Jonas) put his socks on inside out today."
Some may think that OMJ stands for "Oh my Jonas". But they are infact very wrong.
OMJ stands for "Oh my Jon". Jon as in Jon Walker from PATD.
panic boardies were the first to come up with this seeing as how Jon is god and as most people would say "oh my god" they say "oh my jon"
Tommy: Can you believe she said that?
Meagan: OMJ that was so rude.