Originally used as a salute by the prominent "Black Power" New Zealand gang, now it has meanings ranging from "whats up" to "yeet" to something you say when feeling yourself.
(salute)
Jack: Yoza brother!
Nikau: Yoza, g!
(yeet)
Jack: Aye yo the Cavs won.
Nikau: Yoza!
Originating from New Zealand or Polynesian countries, It is a term often used on social media platforms alongside the phrase "Can I Yoza up your anuk g", meaning can I ejaculate in your anus.