Details have finally come out about why Cardi B threw the shoe at Nicki Minaj a few weeks ago. Its all because of Cardi's song "Drip" which features the Migos. The song was originally supposed to feature Future and I have the exclsuive reference track to prove it.
Apparently the song was done but Nicki gave Future the option to either stay on the song with Cardi and not tour with her, or tour with Nicki and jump off the song. He ended up getting off the song which is why he was replaced with the Migos. Check out the reference track below.