Top Definition
A secret that not even the secret keeper or teller knows.
No one knows so its a ninja secret.
Person 1 " so hows life"

Person 2 " its a secret"

Person 1 " you can tell me your secret"

Person 2" its a ninja secret"

Person 1 " what?!"

Person 2 " I dont even know the secret, there for its a ninja secret"
by secretkeeper524 January 18, 2012

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