Definition 1 of 1
When slavery was abolished by the Britishers in their plantations, they needed cheap desperate labour. They zeroed in on the desperately poor Bihari former opium farmers generally now out of work because of the opium wars in China, who lived along the ganges and other people from other parts of India.
Basically the FOBs of those times were the Girmitiyas, the word itself creole for Agreements that the FOBs signed on as bonded labors, and as old habits die hard the typical -ya to emphasize their origins.
Added 2012-11-14 by Mildly Racist