Contrary to popular belief, QQ is not a set of crying eyes. It actually originated with the advent of Warcraft II. On battlenet, you could press ALT+Q+Q to immediately exit the match and program. Thus the term "QQ" was to tell people to just quit because they are unskilled. The term later developed and lost it's origin and is usually mistaken as crying eyes.

In contemporary gamer culture, QQ has become the mainstream emoticon for crying eyes, though it is still often used in it's traditional sense.

the thing that you don’t have when you’re phones percentage is over 20

Originally started in Warcraft, where Alt+QQ is a hotkey to quiting the game.

When someone bitches or whines everyone would say 'QQ', telling them to quit the game because they suck so much.

It often confuses people into thinking that it means, "Cry more noob", but this is totally incorrect. The fact that 'QQ' looks like a pair of teary eyes is just a mere coincidence.

qq is an abbreviation of "quick question"

qq is a Taiwanese colloquialism that is used in other asian countries as well, it means a squishy, bouncy texture, usually referring to food.

Alt QQ, the keystroke to immediately quit an online multiplayer battle in the game "Warcraft 3", and "Warcraft 3: The Frozen Throne"

Literally, QQ is a set of crying eyes. However, given its usual context in online games, it is usually assumed to mean "Cry more noob."