QQ = crying eyes. (QQ)
first time i've seen that, frankly. it's either what Dale used or T_T/TT_TT.
All righty then kiddos. QQ isn't
just crying eyes.
It originated from Alt+Q+Q, the keyboard shortcut to quit a game in Warcraft 2. It's what you would typically use while ragequitting. So when you were dominating someone, you would tell them something like "QQ noob". Coincidentally it also looks like crying eyes. This same context is still used in games, where bad players whining or complaining are mocked as QQing.
In non-gaming contexts, QQ is still generally considered to be a mockery of crying, implying sarcasm when everyone around you seems to be butthurt. If you use it in place of T_T or ;_; (which imply it's you who is crying) you might get called out for it.