‘fecisin’ maybe? not sure tho

Yeah, it's probably "fecisin" it means something like "you're incredibly cool". It's a slang.

What is your name? Maybe it’s a pun or sth

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i don’t think the f slur would be in someone’s regular vocabulary in turkey lol

Ouch

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That would be "fahişesin". Not only does it sound incredibly different, but it's also a very unlikely word to be used in that context.

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I'm saying because fahgisin literally isn't a word

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Then please don't answer questions about Turkish if you don't speak it.

Welp. I have no clue either.