"Why Not" Bang 

When you have the option to bang someone and you have nothing better to do and can't think of a good reason not to so you go ahead.
In programming,

If not_to_bang_reason == NONE :

Return bang!

Person#1: I was there and so was he so I tossed him a "why not" bang.
Person#2: *shrug* why not!
Person#1: precisely.

"Why Not" Bang by MissPoopyButthole June 20, 2019

National gang bang day

On May 10th is national gang bang day!
This day we celebrate the gang bang.

Hi it’s national gang bang day, I wanna call all of your friends and fuck?

National gang bang day by Yeeeeehaaaaw April 15, 2019

necro-gang bang 

when 3 or more men dig up a dead rotting corpse and proceed to have sex with it. as the body is dead, there will be no problem creating new orifices so more can fuck it at once, afterwards leaving the corpse looking like an over-loved hunk of swiss cheese.

simple plan gave hitler a necro-gang bang last night in the woods.

necro-gang bang by fallon picton July 20, 2006

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

Neg Bang 

The act of quckly posting a negative review on a bad product or service because the deliverer of the product refused to offer any refund or proper replacement.

Nacho Mammas restaurant charged me $20 for a jumbo Margarita that contained not even the slightest trace of Tequila. I immediately went to their reviews and Neg Banged them.

Neg Bang by Tiger Leo February 20, 2023

Ai Bang Mai Fa Kin Ni 

Chinese way to say "I bumped into the coffee table".

Chinese Person *BUMPS* their knee to a table violently.
Chinese Person : AHHHHHH AI BANG MAI FA KIN NI, MAI NEEEEEEE!

Ai Bang Mai Fa Kin Ni by Shiine-1 February 22, 2022

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