FOYSC Share definition Flag f*ck off you stupid c*nt. meant for soon to be x wifes mean and nasty lady talks smack. tell her FOYSC. and hope she is smart enough to get the meaning that you dont wish to her from her anymore. FOYSC by soon2befree November 9, 2011 0 0 Get merch Get the FOYSC mug. Buy Now — $32.95 See more merch