2 definitions by Jon Lincoln

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.
by Jon Lincoln April 13, 2011
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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.
1.She said there was no way they were ever hooking up. He just called form her bed. He's got ninja penis.
by Jon Lincoln April 13, 2011
Get the ninja penis mug.