Meaning of weirdo

weird•o

Pronunciation: (wēr'dō), [key]
— pl. weird•os.
  1. an odd, eccentric, or unconventional person.
  2. 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:
weird weird sisters