Definition of oga in English:

oga

Pronunciation /əʊˈɡɑː/ /ˈɒɡə/

noun

West African
  • In Nigeria and surrounding areas: a chief, employer, or superior; (frequently as a form of address) sir, master.

Origin

Early 20th century; earliest use found in Journal of the Royal Anthropological Institute. From Yoruba ọ̀gá chief, master.