Slippery Kenny Share definition Flag Act of Pouring 10W-40 Motor Oil in a girls anus, and then having doggystyle sex with her. Wow Jim I think I should have used 10W-30 cause when I gave her the Slippery Kenny, she almost went balistic Slippery Kenny by Dan386 January 8, 2009 0 0 Get merch Get the Slippery Kenny mug. Buy Now — $32.95 See more merch