Best definition
Wooden Koala
A dildo that is highly popular in Australia, mainly amongst the aborigines. The whole dildo is carved out of eucalyptus

wood, the tree that koalas get their food from. The shaft is similar to a didgeridoo and the head is shaped like a koala, hence the name, Wooden Koala.

Australian #1: G’day mate, how was your night?

Australian #2: It was great, I used a Wooden Koala on my bunghole. Now I can barely walk!