Top Definition
Someone who is very tall for their age/race/sex, but is none-the-less incredibly useless at everything but b ball.

Coined by Sweet Bro & Hella Jeff authour Andrew Hussie
God that dunkass Gilbert is only good for his slamdunk skills.
by Trompe la Mort September 29, 2011
Someone who forgets things often, leading to very problematic outcomes. They are also slightly or very incompetent.
"John's a total dunkass, he forgot to sign out of his g-mail and now he's getting daily letters from adult dating websites."
by TheRickestRick May 26, 2016
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