1 definition by cinquefoil

A sleeveless shirt for ladies; a tank top.

As with wifebeater, the name comes from the absence of sleeves, which allows the wearer to beat her boy (or perhaps any boy) unencumbered. This usage was first documented at the Goatwhore merchandise table during their 2012 tour.
After seeing the band's set, she wanted to get their boybeater, but they only had them in large.
by cinquefoil November 24, 2012

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