noun · having the mouth completely full of something tangible, like food

他满口都是饭，没法说话。

to speak exclusively in a certain language, accent, or style (such as lies or technical jargon)

这个外国人能说满口流利的中文。

adverb · to agree, promise, or respond readily and without any hesitation

我请他帮忙，他满口答应了。