what doese osu mean
I was watching an anime called hunterxhunter and when ever these boys named killua and gon trained they'd say it so nom I'm pretty. Curious about what it means

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Yeah osu is like kinda informal greeting which students often use among themselves.

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There is more meanings to it then one, but i use it more for greeting my close guy friends.
I'm American so i could be wrong, but my Japanese friends says it to me too.

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