Thonchy Share definition Flag Being white trash and disgusting or just very ewww. It is the extreme version of Raunchy and also rhymes with it Shaniqua is looking thonchy which her butt hanging out of her jeans. Thonchy by Kathleena May 11, 2009 0 0 Get merch Get the Thonchy mug. Buy Now — $32.95 See more merch