When a man is horizontal on his back while a woman is riding him cowboy and another woman is sitting on his face. This word derives it's name from the hybrid of the sixty-nine and the "twin towers" that are on top of the male.
A softcore version of the more widely known sixty nine. The dry sixty nine is donw with clothes on. Side effects may inclue: denim face, velcro chin, zipper burn and draw string asphyxia
That girl was such a prude, she would only dry sixty nine!
Come on honey, are you really gonna be that mad? All I did with that girl was dry sixty nine. It was totally innocent!