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
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!"