fat-mouth AmE slang

David longed to reach out into the darkness and shut that big fat mouth up before it could say any more.

Jesus, why can't he keep his fat mouth shut?

You opened your big, fat mouth and that was it.

Bugs admits it was a mistake to open his "big fat mouth".

A reporter knew, and they weren't exactly known for keeping their big, fat mouths shut.

If he makes too much noise, put a piece of tape over his fat mouth.

Carlos hit him, quite hard, with his right fist, in the center of his fat little mouth.

Wilson, keep your fat mouth shut, if you like your tongue where it is.