the act of placing your hand gently over a girl's mouth and punching her in the stomach after she has given you head and you have jizzed all up in her grill. This causes the jizz to seep out of her nose like a dragon who snorts snow.
"Man, Shelly was so pissed when I gave her the 'ol snow dragon."
"I'd be pissed too if you made me look like Whitney Houston!" (by the way, Whitney Houston had/has a cocaine addiction hardee har harr)