Green’s Dictionary of Slang

1. (Aus.) used generically for a girlfriend, a steady female companion.

1907

C.W. Chandler Darkest Adelaide 8/1: Well, ’e (th’ cobber) then started to canoodle with ’is (th’ bloke’s) missus, and ’e (the bloke) began to reckon that ’e ’ad cottoned on to ’is (th’ cobber’s) Sal.

2. see Aunt Sally n. (1)

3. see Sally n. (4)