Sloughili Share definition Flag The language spoken by Slough-heads. Garbled, low, fast mumbling that consists of semi-pronounced words run together.Jibberish. I hung up on the Slough-head, I don't speak Sloughili! Sloughili by darkpixie October 3, 2019 0 0 Get merch Get the Sloughili mug. Buy Now — $32.95 See more merch