A laxbro is a manly lacrosse player. LaxBros have their own language and style that can only be understood by other laxbros. A laxbro nearly always baffles an ordinary human but is never mean to non-laxbros. The language includes broski, brah, and the wall. The style is so complex only a true laxbro could explain it. Normally a white male, but does not discriminate.
Zookeeper: "A tall muscular white man with a stick in his hand tosses a ball to another tall muscular white man while communicating in some sort of language. The laxbro is in its natural habitat."
Similar to lamo, this one stands for "Laugh As Mom Freakishly Rocks Out." It can, however, be used in any circumstances other than your mom (or my mom) freakishly rocking out.