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1.
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!
by lerxst88 April 27, 2009
 
2.
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
by dani_red5 June 30, 2008