Term used by the cast of "MTV's Jersey Shore" or MVP: Mike Vinny Pauly. T-Shirt Time is when you're sitting in the living room in your white beater or any colored tank top before actually putting on your shirt. In other words... "It's the shirt before the shirt."
(catchphrase)—coined by the boys to indicate the appropiate time to change into party attire.
"Angelina just got into a fight with Mike before t-shirt time."—Vinny. "Hopefully, they don't get into another fight and she'll punch Mike in the face before t-shirt time."—Pauly D
The concept made popular by Mike "The Situation", from the popular reality show, "The Jersey Shore".
The concept, as defined by The Situation: "We have an abundance of wife beaters ... we wear before we go out. Then it's T-shirt time. Right before we go out we take off the tank and then we put on our fresh shirt."