1950, Frank Hardy, ,Police! Everyone out! The bloody wallopers are on their way!
1971, John O'Grady, Dealing with Cops, in Aussie Etiket, quoted in 1988, Aussie Humour, Macmillan, ISBN 0-7251-0553-4, page 200,Uniformed cops are generally known as ‘wallopers’, and cops in plain clothes are called ‘demons’. These latter, supposed to be disguised, are instantly recognisable.
2006, Andrew Stafford, Pig City: From the Saints to Savage Garden, page 106,Understandably the wallopers were called, and they cleared everybody out.
