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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
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When you're too bored to sit around all day but too tired to go out and do something.
I wanna do something fun but I'm just so sleepy, I wish I wasn't so dundaisy...
Dundaisy by Mordecca September 24, 2018
Related Words

Dirty Dundas 

when you really need to take a bad shit outside on a major street
"Yo man I really gotta go, I gotta ditry dundas now"
Dirty Dundas by JD February 18, 2004
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 town of 25,000 in southern Ontario. Sometimes known as the "Valley Town" as it is located in the valley formed by the Niagara Escarpment as it bends its way around the western end of Lake Ontario.

Dundas is a nice looking town with lots of Georgian and Victorian homes and a downtown that some people actually use. There are lots of natural areas around Dundas with natural waterfalls, gorges, and forested areas due to the Conservation Authority and the RBG.

Dundas is considered one of the more wealthier areas around greater Hamilton.

If you make fun of Dundas, I'll come and kill you in your sleep. Have a nice day.
I like Dundas, it's way nicer than Hamilton.
Dundas by stewie February 7, 2005
1 n. Corruption of "dumbass", utilized occasionally by mentally challenged AOL users. Use of this word indicates that one is a dumbass.
"OMG you are such a dumdass!"
dumdass by Ultra Sawblade November 1, 2005
When you're losing an argument, but you're also stupid and don't know how to spell.
A: "Terraria doesn't have classes."
B: "Yeah it does dungass"
dungass by NetPaperS March 10, 2020