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1.
It's what you dun.
crazy dad: YOU DUN GOOFD NOW!
4chan: FONTSIZE 72 LOLGTFO
by Skylooooor July 24, 2010
 
2.
To be swindled, tricked, pranked, injured, or similarly malcontented by a man who is naturally very goofy-looking. The word itself is usually shouted after the fact, with the chest puffed-out and the jaw slightly-lowered, followed by a grunt of excitement, not unlike that of a dog (ex. "ARF ARF").
(After unintentionally flicking a coin into someone's eye, causing temporary blindness): "You just got GOOF'D."
by Tha Muthafuckin' Colonel January 31, 2008