It's like cutting through the old right into the new. For example by following the new things, new techniques, new fashion and trends, etc ... nother example: Some people on the cutting edge of fashion have one strip of hair dyed one color and the rest another color. I hope this was helpful :)

By using the phrase 'cutting edge of fashion' you are referring to the very latest styles, trends and innovations. You are setting the fashion for others to follow.