Dirtknob
A mild Aussie sledge, slur or insult similar to muppet, idiot or fool. Inspired by a species of ant, from central Queensland, who can’t build regular sensible anthills, but instead builds a “dirtknob” anthill in the fork of a tree or on top of a fence post.
Jen exclaimed “Ya bloody big dirtknob!!” to her brother Richie when he forgot to bring ice to the bbq.