There's no need to have a cow y'all. "Stallion" is a colloquial term, specifically thought to be a part of Southern AAVE. Words get recontextualized and new meanings are ascribed to them all the time. Language is complex.
Originally Posted by Lena Duvall
Finally, some intelligence, a commodity which is in quite short supply around these parts.
FWIW, the definitions for "stallion" at urbandictionary.com seem to split roughly evenly between "stallion" as synonymous with "stud" (a (usually) well hung male who is good at sex and has a lot of it) and "stallion" as a fine woman. Probably the best definition there that hits both meanings is: "Any person of the opposite sex you find attractive that you would let ride you like a rodeo show."
Based on my very unscientific observations I've tentatively concluded that using "stallion" to refer to a woman is more of an African-American usage than among us tight-assed white folks. But I'm willing to be corrected if that observation is mistaken.
Cheers,
bcg