Inspired by the question from ztrot's interview on osu!talk: http://youtu.be/8COmLt0IBRs?t=54m38sA bunch of times people will think of a username related to their childhood, whether they do it by intention or not. This is not always the case, however, some people chose theirs because they either liked the way it sounded or thought it was cool. Everyone is different, of course.
For me, I chose "drum drum" for a reason I don't entirely remember. But I believe it's based on my past fascination with drums of all sorts. When I was a child my grandmother bought me a cheap Indian drum which I loved a lot (and then it broke of course). Around middle school I had a Djembe drum that I loved to play a lot. And finally in High school my parents bought me an electric drum kit (which I never anymore use because it lacks a tom and doesn't sound that great). Now here I am playing Taiko on osu!, funny how life works.
I'd really like to see replies from the staff