Originates from Son, Norway, where some freedivers constantly posed naked in public upon applying their wet suits. They were commonly known as Snorkelpikkene, which is the plural form of Snorkeldick in Norwegian.
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.
The calm, low-decibel snore your spouse makes while drifting off to sleep, after which follow the cacophonous thunder snorts that rattle the whole fucking bed and knock the pictures off the walls.