A man or woman that constantly makes bad or questionable decisions and or is dumb
"Josh just payed $10 for a candy bar"
"That boy Josh Deadass"
by Hessodeadass January 22, 2017
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A term David Dobrik and his close friends from Vernon Hills, including Ilya, use as an alternative to "swear to god".
David: *heugh heugh heugh* (mimicking how a clown laughs at the start of every sentence), deadass? you're gonna let me watch you have sex?
Ilya: *heugh heugh* (tries to mimic David's laugh but fails terribly and uses his thumb to touch the tip of his nose and act all suave and slick while bobbing his head back and forth not realising his bff manipulated him), yeah *heugh*, deadass man.
by b99lover September 8, 2020
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The more gen z way or "slang way" of saying serious.
I'm deadass gonna slap you if you don't like this definition.
by deware April 13, 2023
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Serious/seriously

Alleged origin: Borough of Brooklyn, NYC.
'Did he deadass wear that shirt for the party?'
'He seriously did.'

'I can't believe you're breaking up with me! Are you serious???'
'I'm deadass.'
by Knowledge Incarnate December 2, 2019
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An insult directed at an individual to highlight their inability to perform a simple task or or otherwise learn from their mistakes and surroundings.

One who has the mental acuity of a corpse's ass.

Not to be confused with the adjective dead-ass or dead-pan which describe the seriousness with which someone emotes or conveys something.
Person A: *pushes on door clearly marked "PULL" *

Person B: *waits frustratedly behind Person A *

Person A: *looks at sign... pushes harder*

Person B @ Person A: I think it's a pull not a push, friend.

Person A: I know.. *Grunts while pushing on door*

Person C: *Walks past person A and B, pulls on door and exits*

Person B: *stares as door slowly swings shut in front of them... continues pushing"

Person B @ Person A: DEADASS!
by Cuddle-scut June 30, 2019
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When you wanna end someones career in any argument, just do this one step yell DEADASS then problem solved.
"Did you drink my fucking juice last night? DEADASS"

"You're a fatass DEADASS"
by SwampyAsser July 22, 2018
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When someone is painfully stupid and has near to no life prospects.
Person 1: Hey, why are you getting annoyed at me

Person 2: Because you a deadass
by divine.solace November 17, 2016
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