Boyo is a word used to describe your mates, similar to pals or fellas.
It is often used to take the piss and when the end of the word is more exaggerated eg "boYO" it can
show a sense of
dominance from the person speaking the word.
"Boyo" has evolved into a cult following in South Africa as it can be seen as a satirical word, mocking the lives of rich young white South Africans who feel entitled.
This word is legendary and
will always be a part of Urban slang.