The tendency of one to be sexually attracted to one's own snowman. Intercourse is usually impossible, or at the very least, painful.
Bill: Awww God, my dick is still ringing from that last session.
Jon: What... you don't use lube?
Bill: No, not that. I've just been exercising my Snowmosexuality.
Jon: WTF is that?
Bill: Check the Urban Dictionary.