Ninja Nipples
What a woman has if she goes all day without a bra on and no one noticed.
We were out all day with Jane and never noticed she wasn't wearing a bra. It was nipply out and she wasn't wearing a jacket either. The woman's got ninja nipples!
Nipple ninja
A person who can grope a females breasts without being caught or causing conflict
That guy is a fucking Nipple ninja
Nipple Ninja
A member of a not-so-secret and vaguely homoerotic society originating in Danville, California. A Nipple Ninja is fluent in many techniques of nipple flipping, and performs his art on unsuspecting victims. These moves (examples include: The horseshoe, the rainbow, the monkey wrench, and the Horny Hungarian) can be performed in friendly or unfriendly situations.
Holy shit, that Nipple Ninja just pulled a "guillotine" on Madlwski's fat nips.
Nipple Ninja
What a baby is called when displaying innate ability to fend off removal from the breast when feeding.
"Agghhh, the Nipple Ninja is chewing my nip, but I can't get her off!!!"
Stealthy Nipple-Ninja
When you're about to cum, twist the girl's nipples as hard as you can so she freaks out and screams and is distracted, oblivious to the fact that you're blowing inside her
The day before my two weeks notice was up was the same day my asshole boss gets back from Sweden; therefore, I pulled the stealthy nipple-ninja on his wife. That'll learn em'