Bah, I hate explaining this.
Back in 99 I had finished watching like all of Dragonball in like a week and a half. I mean all of it, DB / Z / GT / movies / all of it. It was like my first big anime marathon / rush. So I went online to look for pictures and I stumbled onto a forum (fuck, back in 99 I didn't even know what the hell a forum was) and had to come up with a handle.
So I picked my favorite character, Majin Vegita, because I loved Vegita, but Majin Vegita was just pure evil fuck you motherfucker, he was awesome. That face he makes when he blows up half the stadium still rocks hardcore.
Anyways, being the complete fucking SCHMUCK that I am, instead of going with Majin Vegita (my line of thinking was that everyone had picked the name up already) I instead went with ChibiMajinVegita. I ran that name for like 3 years at various forums until I hit SRK in late 2001/ early 2002, where I realized having a name like CMV was NOT going to cut it, so I took out the MajinVegita, kept the Chibi, and then took the first thing that came to my head for no reason, Master.
Thus Master Chibi was born.
It's a fucking stupid name really, haha. I'm the Master of deformed characters? I'm a somewhat pudgy guy, that shit doesn't fit me at all, but it stuck, so for like 5 years now people instinctively call me Chibi. Haha, go figure.