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1.
Commonly known as a sleeping bag.
"Don't forget your fart sack!"
by Helen Robinson January 25, 2006
 
2.
Sleeping bag (esp. a heavily-insulated military-issue bag)
by Alo Konsen September 15, 2003
 
3.
sleeping bag
the good fart-sack is mine,you can have the world war one vintage bag its bear proof.
by dang May 08, 2003
 
4.
1. Sleeping bag

2. A sack full of farts, much like the bag of winds given to Odysseus by Aeolus in Homer's "The Odyssey". Often used as a device to propel ships.

3. See "crapsack"
1. Did you bring your fartsack?

2. I've been stuck on this boat in the middle of the ocean for days! I could really use a fartsack right now!

3. The waiter was being a total fartsack.
by Rachel Woodhouse November 30, 2006
 
5.
A sleeping bag.

A bed.
My ass is going to hit the fartsack.
by Bumkicker Slade April 24, 2005
 
6.
A sleeping bag.

By extension, a bed.
Man, I'm going to hit the fart-sack. See in in the morning.
by Bumkicker Slade April 24, 2005
 
7.
The bed/couch/etc. where you have been sleeping, lounging, eating, playing video games, watching t.v. etc. for more than a couple of days in a row, without showering or going out. You only get up to use the restroom, get something to eat/drink and then flop back down. This type of situation usually means that there is a definate funk surrounding you that smells something like a fart.
Yo Man, roll outta that fart sack and lets go get some grub!! Shheeeeiit, you been layin up in this fart sack for the past WEEK!!! C'mon, lets roll.
by Booootttyyy-licious February 03, 2010