What is the origin of Rolf Harris's singing style?

The oofing and the eifing; "huggadjoong, hing, homm, huggadjoong, huggadjoong" - anyone know? Is it aborginal?

― Brigitte Thunderpeal, Thursday, 9 February 2006 11:44 (twenty years ago)

yo tie me kangaroo down nigga

― jz, Thursday, 9 February 2006 12:02 (twenty years ago)

You call that singing?!!

― tolstoy (tolstoy), Thursday, 9 February 2006 19:25 (twenty years ago)