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1.
"Civilian" a term used by members of the military.
"You don't have that authority."
"I do because I outrank you, civy."
by StonedSharpie September 19, 2009
 
2.
you're regular street clothes that you wear when out of uniform. this includes any uniforms: work, band, military, school, so on.
also refers to costumes or any other required dress you wouldn't be seen in on a day to day basis.
show up to practice in your civies, then we'll change into our performance clothes later.
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i brought civies to change into right after the game so i can still go out tonight without looking like a retard in my uniform.
by Witty Woodstock August 24, 2007
 
3.
Civillians, often used by military personelle.
"Why aren't they in uniform?"
"They're civies here just visiting"
by Melbell September 23, 2005
 
4.
at schools with uniforms days where you can wear watever you want. (usually once a month)
teacher: why arent you wearing you're ugly golf shirt?
student: sir, its civies day!
by panic! September 19, 2006