Somebody who acts immature, lacks in banter and is generally an embarrassment to hang around with, due to this they tend to have no friends (other than sacks), it can also be said that sacks come in packs, as sacks tend to from groups of other sacks, having photo sessions where they take endless photos of themselves, then add them to facebook, or pretending to be drunk off one beer or a sip of wine! The list of sack activities are endless.
She had one wkd and told everyone she was mortal, what a fucking sack
by YELDEP June 18, 2011

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If you want to describe something that's terrible, bad, retarded, nasty, ugly, or anything like these, you call it: "Sack".

This meme was originally created by iTz HLG MoDz.
"Yo, I fucked that chick last night, but she was so sack!"

"Dude your grades are so sack."

"My teacher has got to be the biggest sack ever!".
by iTz HLG MoDz November 01, 2010

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An expletive used to exclaim great unlucky circumstances.
1. "Sack! I stubbed my toe!" or
2. "Oh Sack, my mother-in-law's STILL alive!"
by ChiChiLeBlanc January 29, 2010

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possibly too much
"Don't want to sack you with this project, but try not to slack."
by noixz January 14, 2009

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an aluminium sack in which goon (or cask wine) is packaged. mostly used in australia.
"pass the sack, mate"
by newfoetus October 08, 2006

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A person who consistantly makes mistakes and messes up, most often in social situations. A person who acts in a manner that is looked down upon by others.
Graham spilled his drink! What a sack!
by Irvington November 13, 2005

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when peole are haveing sex its said their in the sack
tim was bad in the sack
by david r July 21, 2003

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Also see definition for fun sack
by x January 31, 2003

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