Shut your mouth/face! Definition 1 of 4Pro Tip 1/3Confrontational Tone Often used during arguments displaying annoyance or frustration. If you keep lying, I'm going to tell everyone to shut their mouths about you! Pro Tip 2/3Not Polite This phrase is impolite and could be offensive; use with caution. Shut your mouth and get out of my room! Pro Tip 3/3Informal Settings Use with close friends or in casual, informal situations. Just shut your mouth and watch the game!