2
equivalent to saying: for real; im serious; telling the truth.
peep 1: you robbed his bike? ...naahhh..
peep 2:im dead ass.
by chimpy August 28, 2004
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5
To be completely and honestly serious.
A reply used by people who have been questioned on the truth of their comment.
To be truthful and not lie.
A truncation of the phrase "dead ass serious".
Guy 1: Yo, swear I saw George (W.) Bush jump that fence for a corndog...

Guy 2: What? nah uh, you're lying..

Guy 1: No, for real! I'm dead ass.
by Tai June 30, 2003
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7
Completely serious.
"Yo, I hooked up with Rebecca last night!"
"No way!"
"I'm deadass."
by AGentlyUsedCondom December 16, 2015
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