Boots-Boots-O

I don't know if it is the "official" logo or not, but scattered in several places in Amarillo is the word Amarillo with both L's replaced by a pair of boots. One of these is on an overpass on the highway, and another is in a restaurant called Cattle Call that we eat at occasionally. We were sitting in Cattle Call one evening having dinner and Kyra looks up at the wall where this Amarillo logo is painted. She says, "Look, that says Amarillo!" She then proceeds to spell it out, "A-M-A-R-I-Boots-Boots-O." She then gets a rather confused look on her face and repeats, "Boots-Boots-O???"