/ Dictionary / Index W weirdo: Meaning and Definition of Find definitions for: weird•o Pronunciation: (w?r'd?), [key] ? pl. weird•os. an odd, eccentric, or unconventional person. a psychopath, esp. a dangerous or vicious one; psycho: They caught the weirdo who attacked the children. Random House Unabridged Dictionary, Copyright 1997, by Random House, Inc., on Infoplease. See also: weirdo (Thesaurus) weird weird sisters Related Content Daily Word Quiz: wizened Analogy of the Day: Today?s Analogy Spelling Bee: Today?s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language