Top Definition
1) a mentally retarded person.
2) a person who is stupid, obtuse, or ineffective in some way: a hopeless social retard.
3) Used as a disparaging term for a mentally retarded person.
4) A person considered to be foolish or socially inept
Man, Johnny sure is an arlar when he walks like that.
by BojanglesOfficial November 05, 2007

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