It is a word used to say guy of friend depending on the context in which it is used.
“Pusha ntanga” – “Push guy/my friend”
My friend: " Ntanga, these days u spend less than 1 hr at gym these days. I often workout alone cos you always drop me ka di last minutes."
Me: " I have a job, and I study."
If you're jobless you'd spend 4 hours at gym. Some of us are TOO BUSY!!!!
— #HandsOffZindziMandela✊ (@MalengaMaluleke) June 20, 2019