I think it’s how you refer to yourself, but it’s been a while since I learned. Like there’s three or four versions of “I”, watashi, watakushi (very polite), and I forget the other two but one is extremely informal and possibly makes you sound like a delinquent.
Edit: ore and boku, can’t remember which is the informal one, somebody who knows more step in and add some extra context please.
俺？It’s generally used amongst friends in casual conversations, referring to yourself informally.
Probably that then! I study Chinese (Mandarin) now, so that’s a very unusual character to me. Apparently it has a similar meaning but it’s only used in regional dialects.
Sorry, I wrote it in kanji because I thought you were still studying Japanese. (the character is ore)
Why did you decide on switching to learning Mandarin?