A ninja is a nigga who can't say nigga at the moment. It is especially useful for white niggas who will get beat down or shot for saying nigga around black niggas who don't know them yet, but the word ninja allows the black ninja to say to the white ninja, "Hey, my nigga!"
If anyone edits this post, you are retarded, because this one is actually real.
What's up my ninja?
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What's up my nigga?
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