Green’s Dictionary of Slang

(Aus./N.Z Und.) a general term of abuse; spec. one who does not pay their debts.

1982		G. Newbold Big Huey 118: Brian [...] was spewing over them [...] saying they were eggrolls and lashers and weaklings, for failing to stick fat.
1991		M.B. ‘Chopper’ Read Chopper From The Inside 112: He has a reputation as a ‘lash’, a man who does not like to pay his debts.