"Oi" is a British version of "Hey", also a music style.
In Portuguese, Oi means "
Hi". Maybe Britain get the accent of the Portuguese while they saved them for the Spanish king.
Oi is used(used to call someone, or to say "
hi" in other version) in Australia,America,
Canada, and, duh, Portuguese countries.
Many people in North America(
Yep, Mexico and Greenland count) says "oi" as a natural part of their language or to do the same thing we do.