Top definition
a girls reward for an excellent night in bed. The shirt is one of the lucky male's T-shirts that serves as a trophy or badge left from the hookup
Do you think he'd give me his fav Vinyard Vines Tee for my formal shack shirt?

Kelsey: So cute! where'd you get that?

Amy: its just an old shack shirt
by fratdaddy24601 December 10, 2013
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