when a persons face is extremly square giving their head a 'box' like look.

A casual invitation / threat used by an individual that is not afraid of fucking someone up.

The boxface is a move so powerful, so devestating that it makes Chuck Norris cry everytime it is done. It is the signature move of one of the greatest Bar room brawlers in history, the great, the powerful MM. The actually move is: Place your opponent inside a large box, then apply the crossface.