"Oi" as in hey, hi , or hello.
"M8" as in friend, person, or just a living thing
Basically when put together can be used many ways, just saying hi or being aggressive.
Saying hi: oi m8 how you doing
Aggressive: oi m8! Oi m8 Are you stupid? Oi m8 Fight me.
by treyvon2014 April 3, 2015
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