A person that doesn't know when to shut up when in a group of people. That has over stayed their welcome in a conversation online and or offline. When someone makes a remark past the moment in time when the joke or conversation is over.
Guy 1: "Dude why do you take my shit, your a trash eating machine."
*25 seconds later*
Guy 2: "I know you are but what am I?"
Guy 3: Ya okay your a trash eater.