1.NounAlternative spelling of old school (“hip-hop or rap music of the late 1970s and 1980s (or more recent music of this style) as contrasted with newer styles of such music”).
2.AdjectiveAlternative spelling of old school (“of or relating to hip-hop or rap music of the late 1970s and 1980s (or more recent music of this style) as contrasted with newer styles of such music”).