A proper Galah

Very commonly in Australian English Galah is used to refer to a fool or idiot.

From this sense arise a number of colloquial idioms. To be mad as a gum-tree full of galahs is to be completely crazy. To make a proper galah of oneself is to make a complete fool of oneself. A pack of galahs is a group of contemptibly idiotic people.

These guys (Galahs) are the Court Jesters of the bird kingdom....