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That phrase you always hear when the good guys are faced with imminent danger that requires there participation in the defense of a particular strategic location. Of course, the big tough guy who is rudely waking the cadets from their slumber would probably say it even if it WAS a drill.
Manly Sergeant: Everybody out! This is not a drill!

Everybody Else: **Frantically puts on gear**

_____________________________________

School Teacher: Everybody out! This is not a drill!

Kid: You know what? Somehow I doubt it. I think I'll just go finish up my chem homework while you guys go stand in the rain.
by Enough Free Time to Post on UD January 08, 2011
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2
Indicates surprise, shock, disbelief or urgency. Preferably spelled using ALL CAPS. See also: OMG, WTF, For real, Legit
This is not a drill. My dad just road my hoverboard to Chipotle

Miley & Liam are back together. THIS IS NOT A DRILL.
by Rando Kalrizzian April 25, 2016
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