Pronunciation: (mouth'fool"), [key]
1. the amount a mouth can hold.
2. the amount taken into the mouth at one time.
3. a small quantity.
4. Informal.a spoken remark of great truth, relevance, effectiveness, etc.: You said a mouthful!
5. a long word or group of words, esp. one that is hard to pronounce.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.