Thanks a bloody lot for this forum, I have spent the better half of the day reading all of these, and it is so much fun seeing the origins.
As for my username, I had a shirt that said "Sorry, I was not listening" when I was a kid which I loved. It kind of matched my personality, I used to be quite aloof. it also sounded funny. These reasons, I decided when I was like 10 to always use this username. But, the word sorry had to be omitted as it was too long. So, it became "Iwasnotlistening". Coming to more modern, games there was now a rule of only 16 letters, so I had to make it "Iwasntlistening" which it is right now and hopefully won't have to change forever.
This name is quite ironic to Osu! as it is a rhythm game, but well...