One who is generally dumb and does not understand references to simple subjects. Usually abbreviated to F.S.
Me: Dude, Johnny just got Glenn Beck and Ed Hardy confused.
Friend: What an Flour Sack!
Me: I know! He's a total F.S.
Friend: What an Flour Sack!
Me: I know! He's a total F.S.
by DaRumblyTank February 10, 2011
a women of illrepute that makes so little money that cant afford proper slut garb and has to use a flour sack as a work smock
charlie sheen and hugh grant had all the good women of low morale and i got stuck with jackie stallone pshycic astrologer to all the flour sack whores.
by mike e boy September 6, 2005