You have to read about these amazing, badass ladies. Fire eating became their symbol, here’s a blurb on its origin.
[It] grew out of tragedy. Last year, a lesbian and a gay man, Hattie Mae Cohens and Brian Mock, burned to death in Salem, Ore., after a Molotov cocktail was tossed into the apartment they shared. A month later, on Halloween, at a memorial to the victims in New York City, the Avengers (then newly organized) gave their response to the deaths. They ate fire, chanting, as they still do: “The fire will not consume us. We take it and make it our own.”