Not to be confused with dumbass
, DUMB-ASS actually refers to any stupider-than-stupid female in a TV show or movie that is such a mong
, they're only good for their ass (to have sex with, given most DUMB-ASSes have fairly good looks).
Note that in order for a female to be classified as a DUMB-ASS, they generally have to do something stupid and blatantly obvious that ends up killing themselves.
Myrtle of The Great Gatsby, Candy's wife in Of Mice and Men, but not Padame of Star Wars or Elastigirl of The Incredibles.