The act of inserting ones testicles and scrotum into a sleeping person's open mouth and laying your penis parallel with the bridge of their nose(Kind of like the nose piece on a Roman helmet)
Dave: Hey Conner! Rememberthat time I gave you a Bavarian Snorkler when you slept over?
Conner: What are you talking about, scrub?
The Seattle Snorkeler is when you enter hyperspeed mode when giving a rim job or just licking out a girl (or man) and then blow into the vagina or anus to make bubbles come out.
When you are getting a blumpkin, you must not stop there. When you are about to blow pull your cock out of the girl's mouth immediately get behind her and ram it in her brown eye and shove her head in the toilet and just make her bob for those brown snakes. 1 you have to have shit in the toilet to so this it is a requirement, 2 do not be a stupid fuck and drowned the girl, 3 have fun.