You got the correct word then, but the wrong (although original) meaning...
Once upon a time, it was simply a descriptive word much like the modern 'genetalia' or 'teapot' or 'door' - but the puritanical disgust of anything relating to reproductive function moved it away from common usage and more toward taboo, until today where it's one of the most disliked words in existence.
It's a strange world we live in where a traffic jam can be described as 'torture' (arguably one of the worst things it's possible for one human to do to another) and other terms related to pain and suffering are bandied about like it's nothing yet words describing the very act that allows the human race (and every other member of the animal kingdom) to propagate or the body parts used in such acts are socially unacceptable and classed as swearing (/cursing)...
It's very rarely used toward women, unless they're particularly deserving of the term.
From what I gather, the US usage is somewhat akin (albeit even less pleasant) to the British terms 'slapper' or 'bike'.
I believe, sometime in history, it was used in much the same manner here - if that's correct it likely explains it's modern US colloquial meaning.
The Urban dictionarys a few valid entries, but only visit if your mind is a bit open