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 27, 2011
Get the flour sack mug.What you say when something isn't right in Smash Bros, such as the exclusion of a character you all want, the addition of stupid items or changing the Final Smash of a character (e.g. Giga Bowser not being playable.)
WTF? Ridley and Piranha Plant got in the Smash roster, but not Waluigi? I say Sack the Sak, he's being a dick
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