Originating in south Australia, it is a term used to describe what is internationally known as a douchebag. Loves to strut around, beating it's chest, makes an effort to display tattoos if it has them in order to intimidate, will get online and with the aid of dictionary.com try and dazzle you with it's pseudo literary brilliance. Just an all round, pain in the arse wanker.
Have a go at this dickhead, what a drewbower.
Check out this drewbower, all puffed up like a peacock.
Just because he has tatts doesn't make him tough, he's just another drewbower.