Mealjacker

Someone who joins one or more people in a public eating area, who is not invited or welcome, and immediately wrecks whatever conversation, vibe or mood that was occuring, often with their mere presence. A mealjacker normally has no idea he is jacking someone's meal; he normally believes that the person or group actually wants him to be there. This common misconception is often predicated on polite small talk and the social norm of not being able to actually tell someone to sit somewhere else. Closely related to the cock blocker, the meal jacker strikes only during meals, when his victims are most vulnerable and least able to flee. But her powers of social extinguishment are not limited to potential romantic interaction; the mealjacker virtually shuts down all social conversation.