TOO FAST! SHORT SET.

It sounds like you're referring to a "Boy's Short Set," which typically consists of a matching top (like a T-shirt or tank top) and shorts, often sold as a complete outfit. If you're referring to a specific design or theme called "TOO FAST!", it might be related to a brand or a popular style that features bold or edgy graphic designs, perhaps with racing, speed, or energy-themed graphics.