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According dito GDoS it may derive from the card game Faro:

Soda:

1941 Baker Popular Dictionary of Australian Slang 69:

(of a person) one who is an easy or suitable subject for exploitation. (2) Something easily done.

According di GDoS it may derive from the card game Faro:

Soda:

1941 Baker Popular Dictionary of Australian Slang 69:

(of a person) one who is an easy or suitable subject for exploitation. (2) Something easily done.

According to GDoS it may derive from the card game Faro:

Soda:

1941 Baker Popular Dictionary of Australian Slang 69:

(of a person) one who is an easy or suitable subject for exploitation. (2) Something easily done.

1
source | link

According di GDoS it may derive from the card game Faro:

Soda:

1941 Baker Popular Dictionary of Australian Slang 69:

(of a person) one who is an easy or suitable subject for exploitation. (2) Something easily done.