Hey guys! Can u plz help me? whats the meaning of the word " banji "?

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According to the Urban Dictionary:

An acronym meaning "Be Authentic Never Jeopardize Individuality" made popular to the mainstream public by Sharaya J in the song Banji produced by Missy Elliot

So it isn't really a 'word' at all.

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If you meant, "Bungee", then:
http://en.wikipedia.org/wiki/Bungee_jumping

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Where did you hear it? What was the context?