Watch your mouth/tongue Definition 1 of 2Pro Tip 1/3Anger Indicator Often used when the speaker is irritated or angry about another's words. If you insult her cooking again, you'd better watch your mouth. Pro Tip 2/3Authority Figure Typically used by someone in authority — like parents or teachers. Young man, watch your mouth in my classroom! Pro Tip 3/3Cultural Sensitivity The phrase can imply cultural disrespect and may demand cultural sensitivity. When discussing traditions, you better watch your mouth.