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1.
Adj.

Progression:
brain dead-> vegetable-> mustarded-> retarded-> slow-> average-> intelligent-> genius

Of seemingly average intelligence but in fact so mystifyingly stupid that even retarded individuals comment. Often accompanied by the hubris of thinking one is God's gift to everything; A certain path to a Darwin Award.
His friends commented on how Mustarded it was when he ate shit trying to skate down The Hill.
by Attmay Ustardmay September 17, 2006