Jimmy Fallon challenged YouTube star JoJo Siwa to an 'aggressive dance-off'

10:48pm PST - January 21st, 2019    jojo siwa - Mashable

There are dance-offs, and then there are "aggressive dance-offs." Jimmy Fallon challenged wildly popular 15-year-old YouTube dancer and pop star JoJo Siwa, known for her appearances on Lifetime's Dance Moms and Abby’s Ultimate Dance Competition, to one heck o…