I was wondering about kızım and ortak.

Kızım seems to be a popular way to address a friend? Would this mean my girl? I think it´s mainly between girls or women that are friends. But could a guy say it to a girl, in a friendly way? Could a guy say it to an elder in a friendly or joking way or not a good idea?

Same questions but with ortak, I think means partner but it a business sense or could this also be said between friends like - howdy partner - merhaba ortak. Just wondering?

Thanks everyone, I know I just thought this was for a few questions.

Older people can say kızım to younger woman or girl, also boy can say that to his girlfriend.

You can say ortak to everyone you want, if you want to sound cool you can say ortak to your close friend

Thanks Kedi Nero.

(Sounds like I need to choose my words more carefully)

RE: "Düşün!" - I often use the phrase "Aklın beş karış havada mı?" ("Is your intelligence five spans in the air?") - humorously, of course! - with my students.