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The superfans at concerts who mysteriously appear wearing a brand new t-shirt from the merch booth with no sign of the shirt they originally wore into the venue.

OR

People who wear the concert t-shirt the very next day as if to appear cool and elitist.
"Look at all these people wearing the band's t-shirt at the show. They are such conshirts."

OR

"Guess who saw Def Leppard last night? They are complete conshirts."
by Andy Poncherello October 10, 2008
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