Top Definition
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.
#ninja cock #sneaky snake #stealth shaft #surprise wood #peakaboo pecker
av Jon Lincoln 12 april 2011
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.
#ninja cock #sneaky snake #stealth shaft #surprise wood #peakaboo pecker
av Jon Lincoln 12 april 2011
A penis, made by a ninja it is normally a super long rod that you can hit your mates with. You can also stick it up peoples vagina holes. It's great.. I use them all the time
James: Can I show you my Ninja Penis?
Jessica: Only If you stick it into me ;)
#ninja #penis #mum #my #balls
av Magicarsewhipe 5 april 2009
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