A rule referring to telling people that there is now an option of wearing a shirt or not.
-TARPS OPTIONAL PARTY (guy#1)

-Yo, where can i leave my tarp? (guy#2)

-you can hide it in my refrigerator. (guy#1)
by matmo February 10, 2010
adj. when wearing a shirt is just an option because of weather, location, etc.
Jake: Man its so hot out right now
Spencer: Yeah, I think its a Tarps Optional day today.
by DJ Suspense July 30, 2010

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