A short lived craze that dies out instantly after its time. In music, that would be being huge in one genre of it and then once that passes you fall into instant irrelevancy. NSYNC and Backstreet Boys are examples of that. They were only relevant with bubblegum pop music and then when that past they had ZERO relevance.
It works for other genre's too though, like R&B, Country or Dance/Electronic....as we've seen