Green’s Dictionary of Slang

(Aus.) to obtain a loan.

1919		W.H. Downing Digger Dialects 50: tig (vb.) [...] Extract a loan from.
1924		(con. WWI) A.G. Pretty Gloss. Sl. [...] in the A.I.F. 1921–1924 (rev. t/s) n.p.: tig. Extract a loan.