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1.
Similar to motard. A person that is only lightly retarded. A person a tiny bit on the retarded side.
Sometimes Frank has a lazy eye. It gives off the impression that he's a tetard.
by Jackalman November 11, 2007
 
2.
A tetard is someone who is a retarded testicle head
"Germans with dark blonde hair and white are tetards"
by stevenqball November 21, 2005