its a person in specific who wields always a shotgun in any kind (videogames or real life) goes behind you and pulls the trigger while aiming your rear end.
The act of sticking one finger in a girls mouth like a hook and then proceeding to eat her N2A, aka Nose to Ass.
Thursday night was nookie night in my household, and I could tell it was my turn to return the favor. I grabbed my wife by the mouth and began shotgunning her like a champ.
This means that your newly purchased product that sentence is aimed at was a disastrous mistake to buy.
The sentence is used originally for those who bought Shogun 2, and were suprised by the shitty game. Later on, they would use it for any failured purchases.
¨I bought this new game for 55 bucks, it became a shogun¨