记住：''''You eat with that mouth?''''不是“你用嘴吃东西？”

You talk dirt a lot. You eat with that mouth? 

你脏话连篇。你说得出口?

Do not badmouth me!

badmouth 是一个动词 ；非正式表达：to criticize (someone or something) in a very unpleasant manner，指诽谤、唱衰别人

Don't badmouth my friend in front of me. 

不要在我面前诽谤我的朋友。

stop mouthing off 

不许顶嘴

The parents will tell their child to stop mouthing off.

父母会告诉他们的孩子不许顶嘴。

I had my heart in my mouth. 

如果你很紧张或者提心吊胆，你可以说I had my heart in my mouth. 意思是，我心吊到嗓子眼了。（跟中文有点相似。）

 I had my heart in my mouth as the results of the competition were announced.

比赛结果发表时，我紧张得心都要跳出来。