sertanejo noun2 •In Brazil, someone from the countryside; a backlander.Life in the open air had made him as tanned and weather-beaten as a sertanejo. — 1984 •A type of Brazilian folk music.I hate sertanejo music. This has something to do with when I was a teenager and my dad liked sertanejo while I wanted to be totally different. — 2010 formssertanejos