>>3
From what I understand, DQN is used to describe juvenile delinquents, the kind of rough kids (or adults) who try to look tough while actually being idiots. Basically another term for "Yankees", the uncultured, dumb wannabe gang members. This is the image of DQN: http://dic.nicovideo.jp/oekaki/190494.png
It can also be used to describe people or companies that completely lack common sense. (source: http://dic.nicovideo.jp/a/dqn)

However, I do like how we've sort of adapted it here as a sort of self-deprecating term. It's taken on a new meaning.