My username goes back to my days of playing the PC game "Return to Castle Wolfenstein".
I thought that killing me in that game was "like taking candy from a baby". So, at first I adopted the name "Baby with candy". Then, I thought of combining with another phrase which is associated with war, "Are we men or are we mice".
I simply took Baby from one phrase and mouse (mice) from the other, and you end up with : Babymouse.
I actually used alternate colours for each letter in Wolfenstein, with a ! mark on the end of it:
BaByMoUsE!