SSIG is the largest gaming community in Romania. It stands for "Societatea Secreta a Iubitorilor de Gamerite" (romanian) aka "The Secret Society of Gamer Girls Lovers". It was founded by "Magnumutz" on 15th of September 2014.
Person A: "Hey, have you heard of SSIG?"
Person B: "Oh, yeah, of course I did. It is the best gaming community you will ever find, lmao"