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.
Bruce saw Tony walking with all of his seven children and said “ Hey Tony, bring those little bambeaners over here, so I can teach them how to playsoftball!”
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.