In reference to the Ninja/Ninja Pro perk of the CoD games. It's basically a fancy way of saying that you don't have trouble being quiet/sneaky.
Most often used when your friend is worried about you making noise when sneaking out of or into your house.
Teen 1: C'mon man, let's go!
Teen 2: Did your dad hear you?
Teen 1: Relax buddy, I'm running Ninja right now.
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