Who ever said they think it is becoming a popular term in the military, you are somewhat correct. I am a Staff Sergeant in the United States Army. I have been to Iraq three times. Out in the field (A.K.A. a battle field) people do say "Stay Frosty", but we all have our own terms within our own platoon and squad. It is also just like the term "Never pet a burning dog", (Both of which happen to be titles of "Generation Kill" movie series) which basically means, don't try to help something or someone when it's too late. But thats just what I think it means, to other people it means something different, it could mean dont try to fix something when its not broken or it could literally mean don't pet a burning dog.