Craze/kreɪz/ Definition 1 of 4Pro Tip 1/3Temporarily Popular Understand 'craze' as something with huge, but probably short-lived, public interest. The fidget spinner was a huge craze in 2017. Pro Tip 2/3Followed by Many 'Craze' often implies many people are following a trend, not just a few. Social media challenges often become a craze overnight. Pro Tip 3/3Cultural Phenomena Crazes can be cultural symbols of a particular time period. The disco craze defined much of the late 1970s.