The backlash begins?

The other day as we were driving through a neighbourhood not far from our home in south London I saw a young man walking along the pavement wearing a T-shirt that caught my eye. It was baggy and white, and the black lettering across the chest screamed: Slow Sucks. My wife and I had a good laugh, but I wanted to know more so I leaned out of the car and tried to engage the man in conversation at the traffic lights – not exactly normal behaviour in London. He must have thought I was a freak, or a debt collector, because he put his head down and started speed-walking in the other direction. Who was the mysterious Slow-baiter? Where did he get that T-shirt? If anyone can shed any light on this, do drop me a line…