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A foolish and fairly stupid person, usually online, who is generally completely oblivious to how much of an idiot they come off as. They usually have poor grammar, bad social skills and there's seldom anything thought provoking or even remotely interesting about their opinions and/or they post things that are ridiculously off topic to the discussion at hand.

There are two flavors of them: the young and immature garden variety Dunks and then the trollish, masochistic lifelong ones with something seriously wrong with them emotionally and mentally. Most Dunkasses are often young and usually mellow out as they get older and learn better netiquette, some even becoming valued and productive members of the community in question, though a rare few, people like Christian Weston Chandler, will stay completely unrepentant, stubbornly refusing to learn from their mistakes and learn social skills. A lifelong Dunkass often ends up with a long list of communities from which they've been banned and a bad reputation across their fandom or community.
Sam just posted something so stupid on our message board, he's such a Dunkass, we may have to ban him if he doesn't grow the fuck up.
Dunkass by ShinCookie November 2, 2016
Related Words
a word used to describe one's male offspring during the puberty process.
Wow Tom, you need to lose that dingass attitude when you speak to me!
dingass by EEDDDDDDDDOOOOO December 2, 2013
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."
Dunkass by TheRickestRick May 26, 2016
A person who cannot spell or type and happens to be a dumbass.
Oh snap, that guy Zus is a dunbass.
dunbass by Will March 15, 2005
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.
Dunkass by Trompe la Mort September 30, 2011
Someone who is a dumbass or is stupid.Usually people get called it when they’re well annoyed.If you call someone this you must really hate them
Omg she is such a dungas!
I hate her so much

Shutup dungas
Dungas by Girlygirl172 November 24, 2019