Someone who overuses Twitter and constantly "tweets" what they are doing, even when they are taking a shit.
"I need to Tweet that I am watching TV with you while I am sitting right next to you. I need to Tweet that I am getting up to go to the bathroom. I need to Tweet while I am walking to the bathroom. I need to Tweet that I am sitting on the toilet. I need to Tweet that I am taking a shit. I'm a Twitter Shitter!"
A public bathroom stall with covered in tweets. These tweets are usually sexual or graphic in nature and usually posted by anonymous. Twitter Shitters are more commonly found in male restrooms. However, the dirtiest and meanest shitters are found in high school girl washrooms.
Guy1: " Dude, I just came back from the bathroom and somebody fuckin wrote all about their monster shit they had while jerkin off! It was fuckin disgusting"
Guy2: "Well that's what you get for goin in the Twitter Shitter."