Referring to somebody who is fat or large, be it physical or mental - such as intelligence. A person can be a bad barra, where they use their barra for wrong doing. The most famous barra is Barra Bulge and Barra Chegwin, who reside on the Wirral Peninsula.
A guy who is always doing crazy stuff and is usually the life of the party. He is a popular guy and is usually found making out with a girl or drunk. Everybody wants to be a BARRA but nobody can be as cool as him. If you go to a party with BARRA you could wake up in another country.
Guy: That was an amazing party last night
Girl: Yeah you totally pulled a BARRA
Guy1: What happened last night? I woke up naked with some chick.
Guy2: Yeah we all did a BARRA. It was one craazy night.