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 sackmug. Two guys penetrating one girls vagina and ass at the same time and their balls slap against each other
by ling69 November 9, 2013
Get the slap sacksmug. A condition caused by excessive lint (commonly present in a new pair of underwear) clinging to the scrotum after the first use. The fuzz will fuse with ball sweat or Fermunda Cheese giving the appearance of an African-American's scrotum.
Trisha was disgusted at my Black Sack! She didn't believe that it was from my new pair of Fruit-of-the-Loom boxer briefs.
by RealTexarkanaTits August 26, 2013
Get the Black Sackmug. The overly-tight flared pants worn by ballroom dancers that are inherently designed to highlight, accentuate and "showcase" the area from the ass crack to the nut sack. Also known as nutslacks, assplants or chodehuggers. Standard slack of choice for men appearing on "Dancing With the Stars." Typically worn with a button down shirt offering only a single button, usually located at the belly-button area.
Looks like Jerry Springer is getting voted off tonight ... they've saddled him up in a pair of crack to sacks.
by Matt Bailey July 28, 2007
Get the crack to sacksmug. by Steven Nyhuz August 26, 2004
Get the Scrot Sackmug. by suicidebomba69 January 24, 2011
Get the Du-Sackmug. When your balls hang so low they get stuck in your bike pedals but you still pedaling like they ain't.
by Tittyspanker47 November 3, 2016
Get the Sack cyclingmug.