What is the meaning of made a mouth in idiomatic expression?

The idiom "made a mouth" is not a standard expression in English. It's possible you've misheard or misunderstood the expression.

Could you provide more context or the full sentence where you heard this phrase? It might help me understand what you're trying to convey and offer the correct idiom.

For example, perhaps you meant:

* "Made a face": This idiom means to make a grimace or expression of disgust, disapproval, or pain.

* "Put a foot in their mouth": This idiom means to say something embarrassing or inappropriate.

Please give me more information, and I'll be happy to help!