Ninja Bang 

When two people go to a public place to fuck, and no one heard or saw anything

Me and Laura went to the park. I totally ninja banged her, no one even knew

Ninja Bang by katanainthestone May 22, 2009

ninja bang 

To have silent sexual intercourse on the floor with minimal clothes removal, as to avoid discovery of fornication. Usually done by people who still live with their folks or prudish friends.

Juan: yo, we gonna have to ninja bang today, mamacita, cuz my folks are in the next room

ninja bang by gothaliciouswithcheeze February 13, 2014

ninja banging

To have sexual intercourse with someone in a public place. With only the party members being able to have vision.

Jenna and I went to the park for a quick ninja banging.

ninja banging by luvstosplooge November 27, 2014

Ninjabag 

To flip someone's backpack inside out, insert all the books/stuff back in it, zip it back up, and hide it somewhere. This is a great school prank to your friends.

John: Yo where's my bag?
Steve: Not sure, but Alex told me you got ninjabagged so good luck.

Ninjabag by Danny Banny December 7, 2011