A vagina with extra-double long skins (Roast Beef Curtains) that hang down potentially to the ankles of the female in question. Roast beef curtains to the ankles = Rankles.
Yo man, I was about to smash out that chic Keisha I told you about until I got her panties off and was disgusted by her Rankles! They were so long and beat-up I didn't know how she was able to walk without tripping over them!!!