1.v. A sexual act in which a man who is being orally pleasured gives no indication of his impending orgasm. As he reaches climax, he places his hands behind his partners head, shoves his cock to the back of her throat, and screams the word snap-dragon. Cum then, in theory, comes out of her nose.
2.v. The ultimate break up move.
When a man is getting head, the female snaps the man's penis in half, and while her mouth is full of blood, the man whispers somethingappalling in her ear, like "I have AIDS", thus making the blood squirt out her nose, almost like a dragon.