According to Webster a Harpy is, "an evil creature in Greek mythology that is part woman and part bird: an angry and unpleasant woman."
"Harpy" as an insult is included in the Shakespeare insult kit at, http://web.mit.edu/dryfoo/Funny-pages/shakespeare-insult-kit.html
When I think of "Harpy" I think of the Harpy Eagle, the largest raptor found in the America's. Their wingspan is between 5' 9" to 7' 4" and females Harpies weigh from 13 to 20 pounds. Male Harpies in comparison weigh between 8.8 to 10.6 pounds. This is not sexism but female raptors usually weigh more.
Harpy Eagle, aka "bad ass" of the bird world.
The Harpy is a creation of Greek and Roman Mythology. The symbolism of Harpies from Symbolism Wiki,
"Originally the Harpies were conceived as spirits of the wind, the personification of a nature occurrence that is frequent in ancient cultures. The sky was a significant place for the ancient Greeks, and much like the deeper parts of the ocean, it was revered because it was inaccessible. Mount Olympus, the realm of the gods, was located high in the sky and so the atmosphere and weather became associated as the whims of the gods. Therefore, it is conceivable that the idea of the Harpies could have come from the consistently shifting winds. It was not until later that the Harpies were given a physical form, for the sake of story telling."
After learning about how awesomely powerful Harpies are I don't care if I'm called one. I like being "bad ass too."