Someone who not only interupts other's conversations, but also insults people in the process.
"So, I was at the mall, and....." "Oh, hey guys! Did you see Marla's shirt? It looked like vomit!" "Hey, we were talking, before you rudely butted in, besides Marla's shirt was not that bad...." "Yeah, like you would know anything about fashion. Your style sucks! Besides, you are always talking. give some one else a turn, big mouth! "Not only are you rude, you are a dissrupter, bitch!"