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.
by tora321 June 03, 2010
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Deass: To exit or leave any given place.
I'm glad this shift is just about over, I'm ready to deass this place.
by vernon February 02, 2004
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