What does it mean when someone says "Oi" as a response to a greeting? [closed]

I’ve had a few interactions with people from countries other than my own, and when I greet them, oftentimes they’re response is just "Oi." What does that mean in this context? Where is it typically used (country) and is it a new thing, or has it been around for a long time, and I’m only just catching on...?


Solution 1:

Oi:

An informal greeting, similar to hi. Oi! How's it going?



(Wiktionary)

https://en.m.wiktionary.org/wiki/oi