Informal/Direct:
* 走開 (zau hoi): This is the most direct and informal way to say "go away." It literally means "walk away."
* 滾 (gun): This is a more rude and aggressive way to say "go away." It literally means "roll."
Polite:
* 走啦 (zau la): This is a more polite way to say "go away." It literally means "go already."
* 唔好再嚟 (m hou joi lai): This is a more formal way to say "go away." It literally means "don't come back again."
* 請離開 (cing li hoi): This is a very formal way to say "go away." It literally means "please leave."
Other Options:
* 唔使你理 (m sai nei lei): This means "don't bother me."
* 你走啦 (nei zau la): This means "you go away."
The best way to say "go away" in Cantonese depends on your relationship with the person you are talking to and the situation.