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1.
A person with 'Be' as a beginning of their name (Bernard / Beatrice / Becky etc) who is a retard. Combine the two - Betard.
Person 1: Why the hell is Beatty licking that window?
Person 2: Because she's a Betard.
by Emma Pies September 24, 2008
 
2.
When a person is being a tard
Goddamn that kid is a betard

Your driving is betarded
by Carter88 September 27, 2010