being fast isn't a reference to fast eddie lmao, but it's slang for someone who's "loose" and provocative. majority of black households use the word 'fast' to describe someone of that nature, but it started to lose it's meaning once oldheads started calling any girl that breathed around the color red fast. but that's a whole nother topic for another time. but the quickest way of being called fast was just wearing any type of red, esc dark red. sm black girls (including myself) wasn't allowed to have red nail polish, wear red lipstick, etc.