1. The penis that a woman never intended letting in but realizes after a drunken night that the penis had made it in. As if the member had sneaked in with the stealth of a ninja.
2. An erection that happens at any moment that surprises a women.
1.She said there was no way they were ever hooking up. He just called form her bed. He's got ninja penis.
2. They were slow dancing and was poked by his ninja penis.
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