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Urban Dictionary Dumbass 

Someone who writes Urban Dictionary definitions about themselves, or people who they know, but who are not famous. Esp. when those definition is "*insert name here* is very cool and attractive."
Person 1: Hey! Jeremiah defined himself on Urban Dictionary!
Person 2: What an Urban Dictionary Dumbass...

Professional Dumbass

Someone who does stupid shit so often, they somehow become proficient at doing it well
Stan is a professional dumbass, he keeps getting himself out of stupid situations
Professional Dumbass by Garlic S August 25, 2020

Dumbassness 

A non communicable disease that tends to affect young adults but may be noticed in older individuals who continue to be carriers for many years to come.
It was out of sheer dumbassness that he opted to get drunk and get into an arguement with a cop...
Dumbassness by nachomama April 17, 2012
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

dumbass dad 

When ur dad is a asshole who is emptyheaded and has now real brains but acts like he knows about anything
I have a dumbass dad i think just knowing him makes me stupid
dumbass dad by .Pyro. March 1, 2018

dumbass people 

People whom do not have any common sense what so ever and continuously do stupid things over and over and over again never learning from their mistakes.
dumbass people by sfol November 2, 2013