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A word used in two different ways by the Military. To describe something that sounds too good to be true, or to describe someones reactions or thoughts to be dumb.
Ex. 1 -

Guy 1 - Man... Why don't we have hour long lunches?

Guy 2 - That's Civilianish.
Ex. 2 -

Guy 1 - Wait! Your in the Air Force, what plane do you fly?
Guy 2 - That's Civilianish... I drive a truck.
by Avionics_Guy7 February 24, 2011