I've been asked this question quite a lot at tournaments. People wonder how in the world I came up with "OOFMATIC", lol.
Basically it began around 10 years ago. After school 3 of my friends would often come over to my place and play 4 player Power Stone 2 on the Dreamcast.
I basically owned my friends in that game, and most of the time when I KO'd them they'd shout out "Oof!" in the form of an exclamation.
So when I was thinking of a username, I wanted something that wouldn't sound too serious, but would also be so original that I would be sure that no one in the world would ever think of it.
Meanwhile at the time of me trying to decide a forum name I was also listening to a bit of Nas' Illmatic album, which inspired me to use the word matic since I thought it sounded cool.
So I came up with OOFMATIC. OOF for the exclamation of pain or in my friends' case defeat, and MATIC which denotes something as automated. And all caps because every letter in my name is as equally important as the next. lol
OOFMATIC: Automatic Pain/Defeat. :P