The letters "QQ" are often used in online communication to signify two crying eyes. It is usually used in the pejorative such as "QQ more nub" meaning "why don't you cry more, newbie".
"QQ" has already become a popular term, and can also be used as a unconstructive response to a post one deems to be a whine.
For example:
Hunter: Why do hunters always get nerfed?
Reply: QQ
Within the context of World of Warcraft one will often see "less QQ more pewpew", meaning basically "try crying less and fighting back more".
For example:
Player A: Why do lvl 70s always gank? What's the point?
Reply: less QQ more pewpew.