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
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
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
Another name for your scrotum, otherwise know as your nutsack.
"God, my fucksack is totally empty from last night's wank"
by Peckerama March 20, 2008

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