D defs.my
Entry 3 senses Webster, 1913

Mouthful

/mouth'-fo͝olˌ/ · Mouth·ful · IPA /ˈmaʊθfʊl/
01 n. As much as is usually put into the mouth at one time.
pl. Mouthfuls
  1. 1.
    As much as is usually put into the mouth at one time.
  2. 2.
    Hence, a small quantity.
  3. 3.
    A statement that has a profound truth in it; as, you said a mouthful![informal]