/ Dictionary / Index N nut case: Meaning and Definition of Find definitions for: nut' case" Pronunciation: [key] — Slang Slang (offensive). a deranged person; lunatic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nutcase (Thesaurus) nutbrown nut coal Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language