The last name of the most gorgeous girl in the world! She is very sexy and has a nice body, she is intelligent, and always gives the best hugs. She lifts me up when I am down and she is just the brightness to my day. I can not think of a day that goes by that I don't just think about her beauty.
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.