When a gay man releases his specimen on his partner's moustache, giving it a fantastic frosty coating.
Guy 1: So how'd it go with Bruce last night?
Guy 2: What a night! First we had dinner, and then we went to his place and I got an amazing a frosty moustache!
Waking up the next morning after going down on your female partner. If you have a moustache then you have a achieved a frosty moustache.
Person with a moustache wakes up: shit, I have a frosty moustache.