1. yakka - Noun
2. yakka - Verb
English Wikipedia has an article on:yakkaWikipedia
yakka (uncountable)
(Australia) Work.
yakka
(Australia) To work.
Yakka foob mog. Grug pubbawup zink wattoom gazork. Chumble spuzz. I love loopholes. Bill Watterson
Hard yakka means hard work and is derived from yakka, from the Jagera /Yagara language once spoken in the Brisbane region. Source: Internet
Other examples are cooee and hard yakka. Source: Internet