Green’s Dictionary of Slang

(N.Z. gay) for a male sex worker to deliberately leave fingerprints on a client’s car for identification purposes if anything goes wrong with the encounter.

2010

W. Ings ‘Trolling the Beat to Working the Soob’ in Int’l Jrnl Lexicog. 23:1 74: Finger printing is a technique where a worker deliberately leaves prints on a car or an apartment door. This ensures that, if anything goes wrong, there is evidence of his involvement with the client .