/ Dictionary / Index H hissy: Meaning and Definition of Find definitions for: his•sy Pronunciation: (his'ē), [key] — pl. -sies. a fit of anger; temper tantrum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hissing hist Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language