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Runners
Sneakers or running shoes.

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Sanger
Sandwich. The earlier term was “sango,” but this form has been common since the 1960s.

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Servo
A service station or gas station — called petrol station in Australia.

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Shark biscuit
A novice surfer or a surfer in general (or his/her board).

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Sheila
A woman or girl — the generic female equivalent of Bruce, though of 19th-century origin. It possibly referred originally to Irish immigrant women, among whom Sheila was a common name.