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To vacate an area completely of all humans, usually rapidly and in response to an emergency situation.

etymology: "de-" (prefix, "remove") + "ass" = "get everyone's asses out of here"
When the bomb threat came, everyone was in a big hurry to deass the area.
Deass by tora321 June 3, 2010
Delassus group is the best Moroccan grower of snacking tomatoes!
Why I overslept my classes?

- I was at Dalassus meeting

- What is that?

-Here at Delassus we only want to give our customers the best. What is the best you may ask? Specially grown fruits grown to perfection and picked when ripe. We would never put any nasty chemicals like GMO or any other pesticides in our products. Other companies who only care for profits and mass produce can not even compare to us. At Delassus, we care for out fruits and our customers!
delassus by Retardelassus March 2, 2021
When a new York nigga is dead serious
I deadass need some new Timbs, B
Deadass by A new york nigga October 2, 2016
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
Word of the Day on February 24, 2020

deadass b 

How New York niggas say "I swear to god"
Guy 1: The Fuk bro what?!
Guy 2: Yep she just threw my brand new timbs right out the window...deadass b
Guy 3: damn thats cooked
deadass b by Typicalnewyorkfag December 11, 2016
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