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."
Jenny: Yo, you ready to go out yet?

Newton: Not Yet, I still got my wife beater on. It ain't T-Shirt Time yet.

<It is now 12am>

Newton: IT'S T-SHIRT TIME!!!!!!!!!!
by MacquarieGuy August 13, 2010

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Top Definition
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."
"You know what time it is, it's t shirt time."
by D-Evil man October 17, 2010

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(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
by NEW JERSEY Diet-SHORE-nary April 13, 2011

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when its time to take off the wife beater(aka the shirt before the shirt) and put on a fresh t-shirt for going out and creepin
ok..its t-shirt time
by rockhound1023 August 13, 2010

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Screaming "T-Shirt Time!!!!" implements the start of getting ready to party.
Dude1: What Time is it?
Dude2: T-SHIIIIIIIIRT TIME ! Let's get ready to party!
Dude1: Alright it's T-Shirt Time!!!!
by SchwanzusLongus August 10, 2011

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After you pre-game/drink with your tanktop or whatever, you go get a dope t-shirt to wear before you head to the clubs and party. made famous by M.V.P. of jersey shore.
T-SHIRT TIME!! Gotta get a good t-shirt. Promoting a Grenade-Free America!
by Jack Cudderisback October 16, 2010

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T-Shirt time: When one takes there "freshest" t-shirt and applys to oneself before going out for a night of smoshing.
At T-shirt Time, he went to his room and got his V neck so that he could look fresh.
by j Breeazy October 15, 2010

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