Oi (interjection) - Wikipedia
https://en.wikipedia.org/wiki/Oi_(interjection)
Oi / ɔɪ / is an interjection used in various varieties of the English language, particularly British English, Australian English, New Zealand English, Irish English and South African English, as well as non-English languages like Hindi/Urdu, Portuguese and Japanese to get the attention of another person or to express surprise or disapproval. It is sometimes used in Canadian English.
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