(Also known as CTD) When you send text after text to someone with any thought that enters your mind, regardless of whether they respond to any of your texts or not. Even when you realize that this is what you're doing, you are helpless to stop yourself.
Friend 1- "I've sent him five texts and he hasn't responded to one of them."
Friend 2- "Why don't you give it a rest already? He's probably busy."
Friend 1- "I know, I just can't stop myself."
Friend 2- "Sounds like you've got a case of Compulsive Texting Disorder to me!"