Are you in Brisbane? This is a typical Brisbane thing. :) I think Stephanie's understood it, but the man probably said "Night, mate." You've probably noticed how frequently we Aussies drop "mate" into our conversation. For the driver, maybe it was "You're right" as in "no worries, you're alright". It can even come out sounding like "yerroit". Sometimes the T can get lost in the mumbling, but I don't advise copying them. ;)

Are you absolutely sure he did not say " 'Night, man" as in "goodnight"? It's very possible... As for the response, I have no idea. "you also"? But it is true that different groups, and regions have different ways of talking. In New Orleans, we anticipate the question, how are you when passing people in the streets, so we don't even ask, but answer "All right".. so two people passing in the streets will only say "all right" to each other, no question asked.

I have no idea. Sometimes different ethnic groups have different ways of speaking to each other. Maybe it was some ethnic slang.