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equivalent to saying: for real; im serious; telling the truth.
peep 1: you robbed his bike? ...naahhh..
peep 2:im dead ass.
deadass by chimpy August 28, 2004
deadass means you serious like you not playin around .
corey: bruh imma deadass slap tf outta you

james: you ain finna do shitt
deadass by jhittt85 May 22, 2020
A slang for serious to be used in any scenario;
"hey, did you hear my boy deadass clapped them cheeks at the party last night?"
Deadass by CloutBoiDeadassB October 8, 2017
Completely serious.
"Yo, I hooked up with Rebecca last night!"
"No way!"
"I'm deadass."
Deadass by AGentlyUsedCondom December 16, 2015
A term used by timbs wearin ass Brooklyn niggas that means serious.
Deadass by Deadasseriousb December 3, 2016
one person is being so serious, they're not even playing around or joking with you
Mike- " I'm about to drop out because I hate school."
Janel- " Boy, you'll get through it, you'll be fine."
Mike- " Nah, I'm deadass."