The cover sheet on your mattress.
When doing the laudry today, don't forget to wash the fart sack.
by victorzulu November 27, 2010
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the good fart-sack is mine,you can have the world war one vintage bag its bear proof.
by dang May 9, 2003
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A slang term describing a bed
I’m so tied, I need to hi the fart sack
by Sophdog5 March 4, 2018
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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 3, 2010
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A sack fart is when someone farts on your ballsack to create a pleasant warm sensation. The giver of the fart may be male or female, and this process is not neccesarily sexual.

Please note, a sack fart is only present when you can smell the fart with your nose pressed to the ballsack. When the smell expires, the ballsack loses its' title of the sack that doth hold the fart.
*Person 1 farts on the Person 2's sack*

Person 2 : Oh, that's so warm and nice, you're an expert sack-farter.

Person 1 : Why thank-you, I am quite experienced. Enjoy your sack fart while you can, because it will be gone soon!
by Heckmeister December 18, 2009
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