appaloosa /ˌæ.pəˈluː.sə/ noun2 •A horse of a breed best known for its colorful spotted coat pattern. •(US, Southern-US) A catfish.A big fish wends its way towards the shape the light makes, stops and sucks at air. Mottled brown and black, with a pink, appaloosa mouth. — 2005 formsAppaloosas · appaloosas