I saw a youtube video of a guy standing at a street corner doing exercises for his social anxiety in London. Saying something like "How are you doing? You're alright, mate?" to a passing by stranger.
What would be an American equivalent to "mate" be?
I'd guess "man". But I was reading something just a minute ago mentioning that "man" would be used between friends not strangers and that threw me off because I used it with strangers all the time.