The Brief: Roast means "insult."

DEEP DIVE
To roast someone is to put them on blast, drag them, or throw shade. The term employs the same fiery imagery as the idiomatic idea of burning someone.
When the one kid who gets on your nerves tries to roast you pic.twitter.com/qJoPyti4g9
— HeartBreaker ๐ค (@talkingmyish) February 26, 2019
โHow many times will you roast Michigan for losing to a Michigan State team without two of their best players at homeโ
Me: pic.twitter.com/dZrRpfASGZ
— #B1GCHAMPS Barstool Spartans (@BarstoolMSU) February 27, 2019