/ Dictionary / Index B black hat: Meaning and Definition of Find definitions for: black' hat' Pronunciation: [key] — Informal. Informal. a villain, as in a cowboy movie; bad guy. Cf. white hat. to behave villainously. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Black Hand black haw Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language