(pornography) A sexual act in which the penis or another object is removed from someone's anus and promptly put straight into another's mouth.

(idiomatic) (in a positive sense) Having a sweet and smooth voice; eloquent.

Not sensitive to the bit; not easily governed. / Hard-featured about the mouth.

Using foul or scurrilous language; slanderous.

Smooth and persuasive in speech, especially in order to deceive or manipulate. / Unclear, muffled, or halting in speech.

Expanding at the mouth.

(obsolete) Having a projecting under jaw; prognathous.

(derogatory, vulgar) foolish talkativeness, logorrhea

plural of mouth bar

(geomorphology) A bar that forms in the middle of an estuary or of a channel in a river delta.