When a girl sucks two penises at the same time with ease such that they sit in her upper cheeks outside of the teeth. This give the illusion of a walrus frolicking on the icy arctic floor.
Dude1: Bro, that chick we brought home last night was something else!
Dude2: Duuuude, I know! When we sloppy walrus'ed her, she made winter-migratory groans that made my nuts quiver.
Dude1: Me too. We have small penises.