seattle slipper Share definition Flag When doing your gf on the washing machine, and "accidently" slip into her ass. i doing my girl last night on the washer as it hit the spin cycle, and i accidently gave her tge "seattle slipper". seattle slipper by Spliff76 August 1, 2017 0 0 Get merch Get the seattle slipper mug. Buy Now — $32.95 See more merch