It's finger lickin' - awkward. Someone thought of using "finger lickin' good" for McDonald's when for years and years it was the selling line for KFC. The photos above do not lie. Lack of research? A bit of side "inspiration"? Outright harakiri? Who knows! Do not the expression has been used in Arabic albeit not too prominently but yes "takol asab3ak wara" was used in association with KFC.