Merry Christmas! In Japan, it’s often shortened to “メリクリ” or “Merry Ku-ri”, so I guess these clever supermarket signmakers decided to reverse engineer it linguistically. Kind of works, since they do say He is the reason for the season and all!
If you enjoy Engrish, you might also enjoy Jew Nail, Little Pricks, and of course, the ultimate holiday Engrish post, the Fuckin’ Sale.