Botard is the word to describe someone who is a bogan and a retard. The bogan part is trashy, lower class, dirty, uneducated and the retard part is stupid, slow, irritating and annoying.
Dano: Oi Hamo stop picking ya nose ya bloody botard
Jenno: Aye Bart, knock knock?
Bartholomew: I don't have time for you, botard.
S: I'm cool
R: No you're a botard.