1. noun A risky, raucous, adventurous, or licentious act, instance, or period of time. I liked to take a walk on the wild side while I was in college, but now that I'm a bit older, I tend to be a bit more conservative in the things I do for fun. Jim, we've had such a quiet, sheltered life together. I want at least one walk on the wild side before we get too old!

2. verb To engage in risky, raucous, adventurous, or licentious behavior. If you're looking for a wild time on your vacation, you should travel with Samantha—she's always ready to walk on the wild side!