(German) what does yo/jo mean in german?

I was watching a Ytitti video on youtube, and they were talking about receiving their coke drink and one friend asks did you guys get the coke or something along those lines and they reply with jo! Is this German slang for yes? Because in plattdeutsch that is what it means. Also what does sie specifically mean and how and when do you use it? Ethnic german just trying to learn his language, Danke!

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