/ Dictionary / Index H het up: Meaning and Definition of Find definitions for: het' up' Pronunciation: (het), [key] — Informal. Informal. indignant; irate; upset: She was really het up about the new city tax. enthusiastic: John is suddenly het up about racing cars. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Hetty heuchera 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