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1.
To sober up and get ready for the challenge ahead.
Man i gotta Get Frosty and grab get the blackshoe past some questionable characters.
by Mr B. September 24, 2007
 
2.
When you get really high. Simlar to stoned or faded. Also, You can use frosted and a past-tense phrase.
"Lets get frosty tonight"

"Wanna Get Frosty?"

"I got so frosted"
by ThrashMetalAttack August 07, 2012