has been defined for all time by Ken:

The Scotch Irish in early America were noted for their wanton ways -- loud, rowdy and very tough girls, and the genre itself for the huge numbers of kids they had and their willingness ... to hop in bed with or marry outside the clan or sept ...
leaving out the parentheticals (which he may re-insert, since it is his quote).

Perfect match for any Scottish gilly-suiter, I should think.