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.
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.
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