Top Definition
Onii-san is Japanese honorific, meaning 'Older Brother'. It is used within both families or close friends. The 'San' is used for a sign of respect by others within the family or outside of the family and the 'Onii' is to signify someone as a brother.
"Onii-san, come over here and eat with us."
by Azeiox December 13, 2014

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