A typical friend who lays on their ass all day pretending to do "other things" rather than actually perform some productive task. This friend may make excuses of homework, school, alternate activities, time-consuming single player games, et cetera. In reality, they are likely sitting on their couch watching TV.
You: Hey, (name), you want to go play paintball or game this weekend?
Friend: Nah. I've got a test to study for, a few papers to write, and a bunch of other things that piled up suddenly.
You: Why are you being such a sack of flour, I know you don't have any shit to do...
Friend: Nah. I've got a test to study for, a few papers to write, and a bunch of other things that piled up suddenly.
You: Why are you being such a sack of flour, I know you don't have any shit to do...
by Raetzain December 18, 2011

by krl November 12, 2003

A fun, yet addicting game played with your legs. Played in a circle with as much people as possible, the general goal is to have everyone kick the sack before it hits the ground; a hack. once that gets boring you can freestyle.
Celebrate Hacky Sack Day
Celebrate Hacky Sack Day
by Jeremy March 28, 2005

A Highschool, College, NFL, or any other type of defensive football player (usually a defensive end or outside linebacker) that is known to get an impressive amount of sacks.
Julius Peppers, John Abraham, Shawn Marriman, Justin Tuck, Osi Umenyiora, Jared Allen, Joey Porter, James Harrison, Mario Williams, and Demarcus Ware are all examples of current NFL Sack Masters.
by LuvDeezNuts666 January 4, 2009

When you pour a beer, down your back, through your crack, off your sack, into your shoe, and then you drink it.
by Tristram March 29, 2003

Brilliant invention of wine in a bag, sold in a cardboard box. After you finish drinking it. You can blow it up and use it as a pillow.
The best part about drinking a goon sack is after your finished you can blow it up and use it as a pillow mate
by pantspirate June 10, 2009

by DJroshni December 7, 2007
