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A term used to describe an incompetent man-child in his 30s who fails to realize that he is an adult.
Chad: Later, I'll catch you gents tomorrow 🤙 *Begins walking to car*
Alex: What does that say on your license plate?
Chad: Oh, it's my last name. My parents got the plates for me as a gift when I got my driver's license. Ya, all the teenagers in my day drove around in cars rocking with plates like these.
Marcus: In your day? I think your day was more than a few years ago Dumbar 🤙
Dumbar by Prophet Dusk March 4, 2021
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combination of the words 'dumbass' and 'retar' (a retarded way of saying 'retard'). Usually used by dumbasses while having an argument with a dumbass to assert dominance. Chief dumbass in the dumbassery spectrum. You automatically lose every argument if someone calls you a dumbar.
Simon Cowell: Joe
Pooplus: Who's Joe?
Simon Cowell: Joe balls

Pooplus: fuck yuo dumbar
Simon Cowell: *contracts final stage penis cancer and dies*
Pooplus: kil
dumbar by bleekretar September 13, 2021
Related Words

dumbar number 

The dumbar number is the number of participants in a conversation beyond which it becomes counter-productive.

The number is unique to every conversation. Some conversations have a dumbar number of 5 while some can go up to double digits depending on the mental stability, social intelligence and epistemic humility of the speakers.

Not to be confused with Dunbar’s number, which is the maximum number of social relationships a person has the cognitive capacity to maintain. So while Dunbar’s number poses a challenge to scaling trust and social cohesion in increasingly large groups, the dumbar number poses a challenge to scaling rational discourse in increasingly large conversations.
I’m leaving, this conversation is way past the dumbar number.

You’re so dumb, you lower any conversation’s dumbar number to one by joining it.

Man, I wish we had social media that increased the dumbar number across the board.
dumbar number by dumbar November 12, 2023

dumbar number 

The dumbar number is the number of participants in a conversation beyond which it becomes counter-productive.

The number is unique to every conversation. Some conversations have a dumbar number of 5 while some can go up to double digits depending on the mental stability, social intelligence and epistemic humility of the speakers.

Not to be confused with Dunbar’s number, which is the maximum number of social relationships a person has the cognitive capacity to maintain. So while Dunbar’s number poses a challenge to scaling trust and social cohesion in increasingly large groups, the dumbar number poses a challenge to scaling rational discourse in increasingly large conversations.
I’m leaving, this conversation is way past the dumbar number.

You’re so dumb, you lower any conversation’s dumbar number to one by joining it.

Man, I wish we had social media that increased the dumbar number across the board.
dumbar number by dumbar November 14, 2023

dumbar number 

The dumbar number is the number of participants in a conversation beyond which it becomes counter-productive.

The number is unique to every conversation. Some conversations have a dumbar number of 5 while some can go up to double digits depending on the mental stability, social intelligence and epistemic humility of the speakers.

Not to be confused with Dunbar’s number, which is the maximum number of social relationships a person has the cognitive capacity to maintain. So while Dunbar’s number poses a challenge to scaling trust and social cohesion in increasingly large groups, the dumbar number poses a challenge to scaling rational discourse in increasingly large conversations.
I’m leaving, this conversation is way past the dumbar number.

You’re so dumb, you lower any conversation’s dumbar number to one by joining it.

Man, I wish we had social media that increased the dumbar number across the board.
dumbar number by dumbar November 24, 2023

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