Swiss Pie Share definition Flag When one has sex with his buddies sister in the butt and then procedes to wipe his penis on his sleeping buddies upper lip. Dude, I totally gave you the "Swiss Pie" last night and you didnt even budge Swiss Pie by PICK-your-VAN-KOOP September 20, 2010 0 0 Get merch Get the Swiss Pie mug. Buy Now — $32.95 See more merch