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1.
A valediction which has come to mean "be cool," but which more properly understood is an admonishment to stay alert and on one's toes. See the quote below for the pop culture origin.
"Hey! I know we're all in strung out shape but stay frosty and alert. We can't afford to let one of those bastards in here."

--Corporal Hicks (Michael Biehn), in Aliens (1986)
by thetaphile July 05, 2006
 
2.
To remain focused by not letting your emotions overcome you
Foot soldier: (Horrified and distracted at the sight of a bunch of burned and dismembered Iraqi children lying on the side of the road)
Officer: Stay Frosty...man the 50 cal., we can't do anything for them now
by zorrokhan January 02, 2009
 
3.
(n.)A term meaning stay cool or stay calm. It is also used as a farewell to friends, and others.
1) I'm out guys so Stay Frosty
2) Dudes, stop arguing Stay Frosty
3) Stay Frosty Crew
by Virus1244 July 31, 2008
 
4.
A term used in the movie Aliens
also used in the game Ghost Ricon.
1) To stay alert, awake, and know what's going on.

2) To pimp
Patrick: Stay Frosty Careen !
Careen: Stay Frosty Patrick !
by careeeen October 17, 2008
 
5.
a manner of telling someone goodbye
syn. peace out, be cool, etc
see ya later tim, stay frosty
by hunts and T$ June 21, 2003
 
6.
Something only a tool, wanna be rapper, or some who's trying to be cool uses. Serves no purpose and only the above uses it.
"Stay frosty gurl ;)"
by Topaz Melody October 08, 2011