This sound is from Big Lez Soundboard

The Big Lez Show is an Australian comedy web series created by Jarrad Wright, Tom Hollis and Izak Whear. It follows a humanoid alien living in the fictional Australian town of Brown Town. The show has enjoyed vast popularity in its later years, with viewership soaring during the third season's run.
See also: Lez Zeppelin, Leslie Segar, Big Tigger, Rap City, White Ox, Datura.