@Jesse_b Bruce isn't Australian slang. It's a name, see
en.wikipedia.org/wiki/Bruce . It was fairly popular at one time (lots of boomers called Bruce), common enough to be used as a generic name in jokes, etc. a lot less common in succeeding generations - baby names come and go in fads, they become "cool" again when they don't remind you of your uncle or your grandma (roughly every 3 or 4 generations)