Someone who has ninja like skills/powers and who is very witty and very good at bamboozeling a person. They also get a lot of gash and fear nothing and no one.
Guns are Ninja. Sex is Ninja. Killingterrorists is Ninja. Killing in general is Ninja. Bombs are Ninja. Beating someone is Ninja. Stealing massive quantities of money is Ninja. Eating meat is Ninja.