An uncivilized and savage individual whose idiosyncrasies are cultivated and sustained by the vast consumption of alcohol.
One must be wary when consorting with brewbarians, for they will unscrupulously pillage and plunder any women, provisions, riches and ale that come within their reach. By nature, they are devoid of logic and reason.
You should have seen Patrick this weekend; he went into total brewbarian mode. Not only did he drink his weight in delicious craft beer, but he successfully fought three ne'er-do-wells and wooed their lady folk accordingly.