You should stop using such a potty mouth at school.
potty mouth
idiomThe characteristic of regularly using vulgar language, especially strong profanities.
The teacher warned the student that his potty mouth would lead to a detention if he did not change his language.
Despite his professional appearance and calm demeanor, he possessed a surprising potty mouth that emerged whenever he became frustrated with his colleagues.
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all mouth and no trousers
Alternative form of all mouth and trousers.
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all mouth and trousers
Superficial, engaging in empty, boastful talk, but not of real substance.
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all one's taste is in one's mouth
One lacks good taste in aesthetic or cultural matters.
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bad taste in one's mouth
A feeling that something is morally despicable as to cause nausea.
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big mouth
The mouth of someone who talks too much, especially by making exaggerated claims or by inappropriately revealing information.
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born with a silver spoon in one's mouth
Born rich, or into a wealthy family.
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butter wouldn't melt in someone's mouth
The identified person appears to be benign, mild-mannered, or calm (but with an integral suggestion that, to the contrary, they really are untrustworthy, disagreeable, or mean-spirited).
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down in the mouth
Sad or discouraged, especially as indicated by one's facial appearance.