Green’s Dictionary of Slang

gig n.8

[abbr. gig-lamps n.]

1. (US) an eye.

[US]Hecht & Bodenheim Cutie 12: The way our hero lost his gig was like this.

2. (Aus.) a look, a glance.

[Aus]C.J. Dennis ‘Nocturne’ in Rose of Spadgers 57: ‘Is this ’ere coot,’ I arsts, ‘well knowed to you?’/ The parson takes another gig. ‘Why, yes.’.
[Aus]J. Morrison Creeping City 8: You pay sixpence to go in and have a gig at his fern-gully and fishponds [GAW4].
[Aus]J. O’Grady Aussie Eng. 42: ‘Gig’ is also heard sometimes in the sense of ‘look’ [AND].

3. (Aus.) an inquisitive person, a ‘busybody’.

[Aus]J. Alard He who Shoots Last 70: Ain’t he a gig, Lucas?
[Aus]Bulletin (Sydney) 26 Apr. 46: If there were Mortons nearby (Morton Bay Figs: gigs, meaning busybodies) the knockaround would refer to whatever it was he didn’t want overheard as ‘gear.’.
[Aus]Smith & Noble Neddy (1998) 107: I am a complete gig [someone who can’t mind their own business], so I went outside to see what I could see. [Ibid.] 210: I chose a spot on a hill overlooking the pay office to watch the armored car arrive. It was a spot unlikely to attract attention from any gigs [nosey parkers].

4. in pl., a pair of binoculars.

[UK]K. Sampson Killing Pool 56: Anderson nudges me and hands me the gigs. She points and mouths ‘white Golf’ and I pick it up straight away.