Gentoo (slang)
Gentoo, also spelled Gentue or Jentue, was a term used by Europeans for the native inhabitants of India before the word Hindu—with its religious connotation—was used to distinguish a group from Muslims and members of other religious groups in India.
Gentio and Gentoo terms were applied historically to indigenous peoples of India; later, to Telugu-speaking persons and their language in then Madras Province (now the Andhra region), as opposed to the Malbars, or Tamil speakers and their language (in what is now Tamil Nadu). An example from the Monsignor Sebastiao Rodolfo Dalgado is "moros, gentivos e maos christãos."
It was also an Anglo-Indian slang term used in the 17th and 18th centuries; however, in the 20th century the word became derogatory.
Etymology
It is unclear why Indians were called Gentoo. As Portuguese people arrived in India for trade, religious conversions, and colonisation before other Europeans, it is possible that the word was derived from the Portuguese word Gentio - a gentile, a heathen, or native. The Portuguese also appear to have used it to distinguish the aborigines of India from Muslims - the Moros or Moors.