One day I needed to come up with a screen name for aol instant messanger and every "cool" screen name i could come up with was taken. So I was feeling like ugh, i don't care what how cool or dumb my screen name is, i just wanna get past registration. So I typed uhhhhhhhhhhhhhhh. Then I backspaced a few "h"'s, and then I put dumb and realized I could ad a "o" and a "y".
Thus, uhsumdumboy was born, and i liked it so i used it for other services that I'd register for.
Not an exciting story at all, but it's the truth.