A specific shirt, worn only on Saturday by salespersons. Much like a lucky rabbit's foot, it is supposed to help bring in large sales for its owner.
"Damn, bro! You be representing, with that team sponsored pit jersey!"

"You got it, man. That's my Saturday Shirt!"
by D1g1TaL Gh0sT April 28, 2007
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A shirt that gays wear to the club on Saturday nights. They tend to be extra shiny, so as to attract more dudes.
1. "Hey dude, check out all the sequins on my new Saturday night shirt. I'm totally gonna attract mad guys"

2. His Saturday night shirt looked rather gay and shiny this evening.
by poopsavage August 31, 2011
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