Huh I never knew this was a "hot box" phrase, I always heard it as the female equivalent of a "sausage fest" i.e. a social gathering dominated by women
Plenty of people, at least at one time, used clambake to refer to a hotbox. “Clambake weed” returns plenty of results, although it does appear the inverse sausagefest definition is more popular. Why can’t it be both?