Verb: To pop bang. Similar to fuck shit up, beat some ass, create a commotion, or (not as common) to kill someone. The phrase possibly refers to the banging noise made when you pop a cap, aka fire a gun; however, the exact origin is unknown. Usually considered a ghetto term or part of ebonics.
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