Fanny Floss Share definition Flag A womans G-string that is soo extremely thin and tight that u could floss ur teeth with it You can see that girls Fanny floss when she bends over Fanny Floss by **aussiehoneybee23** November 24, 2009 0 0 Get merch Get the Fanny Floss mug. Buy Now — $32.95 See more merch