Oye-yoy-yoy, man oh man,

from Eminem – So Much Better Lyrics on Rap Genius

Meaning

“Oi” is used to express surprise or can be uttered when someone makes a mistake, like “whoops”. It is used in lots of countries like England and Sweden.

As in this case though, three “oi’s” in succession can be used after a diss, (just like Eminem does here) it would be equivalent to going “oh damn”, “oh shit”, “snap” or whatever.

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