Fat Face Syndrome Share definition Flag FFS is when you're on the telephone and your fat face dials a number, hang the phone up or presses the volume keys. "... and she was being a bitch so I told her -beep- sorry, fat face syndrome." Fat Face Syndrome by Jennahoe October 22, 2009 0 0 Get merch Get the Fat Face Syndrome mug. Buy Now — $32.95 See more merch