YSG (or Yellow Shirt Guy) is a meme that started because a group of people who shall remain unnamed needed a nickname for someone (BlueGlass) on the AGDQ stream who had mannerisms they wanted to make fun of. They picked out his yellow shirt and set up a restream of the AGDQ stream for the purpose of sitting around laughing hysterically whenever he did or said something on stream. We don't appreciate that sort of thing, even if the meme has since been used for less offensive reasons. Please don't use the term YSG in the IRC chat, thank you. His name is BlueGlass.