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a sacred word, an oath used only to show upmost sincerity. abuse of this word is unholy. if a new york nigga says deadass, you know he’s not capping, he’s telling the truth.
Girlfriend: Are you cheating on me?
Boyfriend: No.
Girlfriend: No capping, are you being deadass?
Boyfriend: Deadass.
Girlfriend: Aii.
Deadass by Timberlord August 23, 2018
A term to stress a person's honesty. It is a complete bulletproof, irrefutable defence when being accused of lying.
Lawyer: your honor, my client is not guilty, nor is he lying, as he claimed he was "deadass fr fr on jah no cap"
Deadass by Samueliscool223 February 23, 2022
Ethan, deadass, did you kill Dave?
Uh yeah no, I-I uh.. I did not kill Dave.
Deadass?
Deadass, dude.
Deadass by don't tell amy September 22, 2020
1)When trying to confirm something. Usually hard to believe.

2)An insult to someone, usually when they say something outrageous and plain stupid.
1) "Lowkey Sally just asked me who my weed dealer is." Josh said. "Deadass for real?" Jordan replied
2) "Puke Green is my favorite shade of green" Cohen said. "Deadass." Ryan said back to him
Deadass by OmaeWaMouShindeiru1 December 19, 2017
When the muscles contained within your gluttus maximus have been starved of blood for a prolonged amount of time, and as a result, have died off, thus the name of dead (the state of being dead) + ass (a slang term for your posterior region)
Yo B I Ah finna go to de hospital cuz Ah godda DEADASS
You B you be bustin mah chops?
Nah B ahmma

D͔̈́̉ͪͤ͗͊̈ ̮͙̬̟̭̉͆̐ͪͥͅE̓ͩ̔ͥͅ ̳̱̻̣͂Ȁ̘͕̲͊̒ ͇͉͚ͦD̞̜̬͖̣ͦͨ̊̊͐̀ ̰̲̥̹̘͈͚͖͎̑̇̿̈̈ͥͨ̔͌Ä͕͉̬́̽̂ͅ ͙̞ͯͤͬͦ̋S͓͚͕̫̼͎̿̀̾ ̱̙̼̲ͫͪ͑ͤS͈̯̻̝̪̺̲̒ͦ̃͐ͧ̊̓͗̑ rahght now
Deadass by /bɛʔ/ May 17, 2018
Can be used in any sentence to mean anything u want or to add and extra kick to the sentence. Or instead of legit, literally, serious and actually.

Can be used instead of geshmak.
Deadass it just took me 20 minutes to open my beer.
Deadass by May Goyang-i August 28, 2019