The fatty deposits on a man's chest that resemble a females breasts. These are sometimes hereditary but mostly due to the excessive amounts of beer consumption.
Dude that guy over there drinking that beer has some big round brewbies!
sitting out side what ever the weather having a brew and doobie at the same time .... take a draw of a joint and a sip of your brew
girl: what you doin?
boy:having a brewbie
boy: inhale then a sip exhale
girl: i like the sound of brewbies