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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
dünß n. suicide; onomatopoeic representation of sound of gunshot
R. Budd Dwyer made dünss on live television.
dünss by Hal Jackson November 15, 2011

Dubassin  

Pronounced - Du-Bah-sin
When you feel like you're at the top, and nothing can bring you down. A really happy, satisfied mood. Extremely well being.

Originated by Sarzilla and Jonathan K.
Man, we just killed that whole dub sack together, How ya feelin?

I'm straight out Dubassin
Dubassin by Sarzilla August 15, 2008
An illiterate's version of dumb ass.
The dumb ass writes dumass for dumb ass.
dumass by Alexandre Dumas July 16, 2008

dumassery 

Full of dumbass
stupidity
not-so-smart decision
What is wrong with him?
Pure dumassery.
dumassery by angology October 27, 2013
It's dumbass, not dumass, dumbass.
dumass by Balls 2 Heavy July 22, 2006