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Generally speaking: a derogatory term for someone who's just a plain idiot. However, sometimes your bros on the inner-circle can be fucksacks, and thus, a term of endearment.
Negative use (derogatory): "Look at this fucksack! He just cut me off!"
Positive use (endearing): "Whattup Fucksack! How have you been muthaf-- I haven't seen you in ages!"

Also note: If you want to refer to someone as a fucksack but you want to keep it clean... (i.e.: a work environment) you can substitute for other words that begin with with F and S.

For example: "Here comes Freddy Sanchez", or "Look at this Flying Saucer over here", or "I still can't believe that Full Screen cut me off!". ... you get my drift.
by The Three-Legged Horse June 11, 2015
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A derogotory term for someone you hate, use it, love it. Generally speaking, these people fucking suck.
Dude, that guy is the biggest fucksack I have ever met...rot in hell, FUCKSACK!
by bonedoggy March 22, 2004
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Someone that a person keeps on the side. Sole purpose to fuck without commitments.
The bar closes and all the hotties are gone, that's okay I gotta fuck sack I can visit.
by mdaddy September 14, 2006
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1. A person with whom you have relations and then toss aside like an empty paper sack.
1. Ashley's nice and all, but I don't see him as anything but a single-serving fucksack.
by Nick Necrosis November 25, 2009
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When you have more than one fuck to give. You need a fuck sack.

A sleeping bag you fuck in.
Let me just check how many fucks I give in my fuck sack.

Hey gurl, wanna get in my fuck sack?
via giphy
by Yeahroyson December 28, 2017
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