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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.'
Deadass by Knowledge Incarnate December 2, 2019
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.
Deadass by b99lover September 8, 2020
The more gen z way or "slang way" of saying serious.
I'm deadass gonna slap you if you don't like this definition.
deadass by deware April 12, 2023
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!
DEADASS by Cuddle-scut June 29, 2019
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"
DEADASS by SwampyAsser July 21, 2018
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
Deadass by divine.solace November 16, 2016