What is Shit In A Bag?
1.
McDonald's food or either by consequence Burger King's too.
Have a nice dinner mate!
Jim: hey man! let's go eat shit in a bag
Guy 2: Yeah let's go to McDonald's
Jim: Maybe.... but i still preffer Burger King's shit
See
2.
When the toilet is so backed up from your roomate taking giant brick shits that you are forced to shit in a plastic grocery bag and throw it into your roomates room
Damnit I have to shit in a bag again!
See