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2.
A bean bag, grey in colour, conspicuously marked, ie. with faecal stains as well as reproductive stains, that is over 15 years old.

It is essential to the achievement of saying the word "Naarnnnnggg correctly.
Man, I was over dere, sittin' on dat dere Poo-Sack when I saw sum quantum fyzix shit rite dere mandem, fook me!
by J-Wizzle-Wizzle January 17, 2010
 
1.
A replacement for the word "crap", "poop", or "turd"
1.) Dude, I took a major poosack in your bathroom.
by Toilette Spray August 28, 2011