A combination of a t-shirt and a jersey. Usually a t-shirt a sports franchise sells, with the name and number of a key player of that team on the back.
Steven: I need something to wear to the Sox game next Friday, but jerseys are so expensive and non-applicable to everyday life!
Zach: Just buy a shirtsey, it's cheaper.
Steven: Oh, duh. Which player should I get?
Zach: Dustin Pedroia. Always Dustin Pedroia.
by Slowdance Boner November 18, 2013

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