Top definition
the game played when one does not know the rumblings of the colon ismass or gas. one can choose mass, and tighten the sphincter and wait to go to a safe location or one can choose gas and releasing the floodgates, thus either farting or shitting their pants. months of ridicule may ensue as well as violence if done on a road trip
I was on my way to phoenix and the rest stop was closed so i decided to play mass or gas. i lost and shit my pants.
by tubanerd2007 March 29, 2010
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