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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
“Dunkard” is a derogatory term for the Amish.
Dirty ass Dunkard, I am trying to drive here!
Dunkard by real_rc3 March 5, 2019

Dunscapped 

Royally fucked up. Totally ruined whatever you were trying to do in the first place.
Man I totally dunscapped that shit.
Dunscapped by Baustin87 August 2, 2019

The Dunkaroo Effect

When you have 1 substance (dunkaroos) which should be used with another substance 2 (frosting), and you end up with way more leftover substance 1 or 2 and you have no idea what to do with the substance in question.
Shant: Damn homie, I have all this frosting but no Dunkaroos left, what the hell am I supposed to do with this?

Brian: OMG dude, I dont know. Thats crazy. The Dunkaroo Effect is difficult to overcome..

Chunka Dunka 

A hench chocolate biscuit that is dunked repeatedly into a large, well brewed cup of tea.
Son of a gun I could do with a chunka dunka right about now!
Could i interest you in a chunka dunka?
Chunka Dunka by 138Hurst October 17, 2011

Dunsparce 

Probably the best pokemon ever. No but really just look at that fucking drill.
Holy shit that dunsparce just drilled through my chest. Kick ass.
Dunsparce by Ruby151chan October 4, 2010