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When the sleeves from your undershirt surpass your over-shirt.
This usually causes flaring out of the sleeves, making you look like a fool.
Guy 1: Did you guys see JC's Long Undershirt Syndrome? today?

Guy 2: It made me want to throw up.
by motherbird May 18, 2009
3 3

Words related to Long Undershirt Syndrome

embarrassed lus shirt style unstlye