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
Get the Fart Sackmug. by victorzulu November 29, 2010
Get the fart sackmug. Calling someone this will gain you much street cred. You only call someone you absolutely despise. Like, with a burning passion.
by iCarlin July 5, 2016
Get the Sack O' Fartsmug.