mumphead

someone who publicly buts in, or intrudes into a private argument or disagreement between two people and denigrates both parties.

This behavior is often seen in a Restaurantor Pub. The Mumphead does not have to know the people arguing. He is more concerned with intruding into the conversation.

Mumphead

A crafty insult to use on fattys, kids, and geezers.

“Haha! You suck! Mumphead!”