1. An condensed word for iPod Jockey.
2. A person who plays music at a night club or bar using a laptop with or without turntables.
3. An insult to any person who claims to be a DJ but relies on a computer or mp3 player (iPod) to play music instead of turntables. Even if turntables are present, the person playing the music is still considered an iJay if the music's original source is from a computer.
I thought your boy was a real DJ until I noticed he didn't have a crate of records. When he hooked up his Apple laptop to his turntables, I knew he was merely an iJay.