Fengping Geng has been making dumplings her entire life, since she was a girl in Northwest China. But it wasn’t until a few years ago that dumplings took center stage at her Squirrel Hill restaurant.

Now, just as quickly and seemingly out of the blue, another rap song has snuck an earworm into the zeitgeist. YoungBoy Never Broke Again‘s “What You Is,” released in September, has spawned the next ...