a) when a girl wears shiny pale colored lipstick making her lips luscious and frosty.
b) a girl with very cold lips
c) when a girl is doming you up nice and juicy-like and asks for your load on her face, and then proceeds to forget what is on her lips, she is said to have frosty lips
a) Paula Abdul - Randy says "Damn, Paula, your lips are lookin' so luscious-like. You got some frosty-ass lips, dawgg!"
b) "Dude, Becca's got some frosty fuckin' lips, gave me shivers." "..... She's dead man..."
c) "Lia, dear, what is that on your lips?" "Oh, shit, I got some frosty lips!"