luvs, it makes perfect sense darling.......trust the Bastard!!!!!
seriously though, it started out as a prison slang term which we have Chris Rock to thank for bringing this term out into the mainstream......but it is just a plain ole rimjob. Good to hear you're already performing this on your man, shows what a good girl you are!!!!
ps. Try keeping a straight face next time you're at an Italian restaurant and the waitress comes by and asks if you want her to toss your salad.........of course this had to happen to me with my two best friends sitting across the table giving me that teary eyed shit-eatinggrin-ready to bust out----face. Not erupting in laughter was probably the hardest self control I've ever had to impliment.