The slogan "Burn Baby Burn!" is associated with fires during race riots in the US during the 1960s. Other race riots such as Ferguson in the US in 2014 also had fires. https://www.bbc.com/news/world-us-canada-30190224 google "burn baby burn" https://en.wikipedia.org/wiki/Burn_Baby_Burn [edit] Burn, Baby, Burn! The Los Angeles Race Riot, August 1965 (1966), a journalistic account of the Watts riots by Jerry Cohen and William S. Murphy Poems[edit] "Burn, baby! Burn!", a poem by Marvin X following the 1965 Watts Riots

It’s a kind of emphasis to the wish or command. Someone is encouraging the fire or the burning of something — they think it is a good thing, and they want it to increase.