IJAG stands for "It's Just A Game". Used commonly after an argument during a game where the opposition says the game is not realistic and or should be realistic.
This is a shut-down reply as this almost always makes the opposition wordless and always sets them to cry.

A cultural and aesthetic mind-state that prioritizes making money, even as an “underground” or “radical” creator. The work isn’t made for money, but it’s the money that matters the most.

Its just a game.