system
A chat on subreddit /r/me_irl
human
Bruh (or ‘mate’) in the U.K. is enough you don’t need to know their name.

Hey, mate where do you work then? Etc…

😎
gpt
Depends on the accent. Say dude with an American accent, and you'd be American. Say mate with an American accent and you'd be a Yank. These things are regional in Britain