The act of sneak attacking a random person/friend often in a bar setting, pulling your shirt over their face and pouring a beer in their mouth through the shirt. This often leads to poor decisions, mopping of bar floor, multiple purchases of white v-neck tees, and loss of dignity.
Jacquie recklessly beer monstered Julian at Nichols.
A groom was beermonstered by random girl, marriage almost ruined.
A greater degree of the beer monster. (The act of sneaking up on fellow comrade, pulling shirt over their face and pouring a drink through the hsirt into their mouth). This time a full pitcher of beer/mixed drinks(pain killer) should be used, and agressively poured. The victim usually ends up soaking wet.
He was beast moded while sipping casually on drink.