Original: Jonathon Green , The Cassell Dictionary of Slang , 1998 , page 1110 The game is also known in Australia as soggy Sao after the SAO brand of biscuits popular there .
Simplified: Jonathon Green , The Cassell Dictionary of Slang , 1998 , page 1110 The term is thought to have originated in Australia sometime in the 1960s .