a mouthful; a bite; a small amount of something consumed or the entire capacity of the mouth (e.g. of a smell or food)

to eat; to chew and swallow; to dine at (a restaurant etc.); also includes consuming liquids such as drinking tea or soup

Commonly used before nouns that do not have a specific measure word, or as a default measure word.

fat person; fatty; someone who is overweight [often considered impolite]