Imaginary drama that you create after someone says something or gives you a look that gives you the wrong idea about what they are truly trying to convey. Most of the time, they're not trying to convey anything...
Courtney: "OMG did you see the look that biotch just gave me!?!?"
Mike: "No babe, you just have idrama!"
Beth: "But Justin said that it was good to see me..."
Lizzie: "He was just being polite when he said that..."
Beth: "No, he totally wants me!"
Lizzie: "No dude, you're just creating idrama."