Chopperhed started a thread about how he came up with his user name and that is where the idea came from.
Some user names "appear" to be obvious, while others are obscure or seem just strange. Curiosity got to me about this, so I will start.
When I started my job in 1988, at the City mechanic's shop fresh out of community college, I was lost. Training was with a big guy (about 6'4") named Bob, who specialized on fire and rescue equipment. Next to his work area was an older gent named Lanny, lovingly known as the old hillbilly. Lanny worked on street sweepers, hot patchers and crack fillers. Lanny called Bob The Big Kid. It was about a week after I started when Lanny looked at me standing next to Bob and stated "Bob, I'm sorry to say but you are no longer The Big Kid. Geno, you are "The Big Kid", Bob, do you see the size of this kid?" I am 6'7" and was about #350 at the time. That was how it started. My tool box has Big Kid painted on the lid, done by the guy who used to label all the cars and trucks. It is now on my license plate. The best part is I still feel like a kid, at least mentally.