Green’s Dictionary of Slang

1. (Aus./US) to mock, to tease; to irritate, to annoy.

1919		Aussie (France) X Jan. 2/2: As he moved along, the Sentimental Gunner visioned himself dragging home a good fat buck. What a gutzer it would be for those who gigged him!
1959		D. Niland Big Smoke 69: What would Billy Godden and some of the boys think if they could read my thoughts now? Would they gig me!
1964		J. Thompson Pop. 1280 in Four Novels (1983) 438: I’d start gigging at her [...] taking it out on her when I felt bad or bothered.
1974		National Observer 1 June 12: Since gigging the girls about libspeak [...] I have been denounced as a chauvinist.

2. (US) to cheat or swindle, to fool.

1914		T. McNamara Us Boys 5 Feb. [synd. strip] I’ll bet a dollar she gigged that dog outer her ‘dellum-kumtesent’ store and slipped it to him.
1914		B.T. Harvey ‘Addenda – The Northwest’ in DN IV:ii 163: gig, v. To cheat. ‘Say, didn’t you gig me a little on the price of that room?’.
1935		J. Conroy World to Win 109: He knows damned well he gigged me out of a dollar.
2012		W. Keyser ‘Carny Lingo’ in http://goodmagic.com 🌐 Gig — To take all of a player’s money in one short session instead of leading him to increasing losses on the belief that he’ll probably win in just one more try.

3. (US campus) to make an obscene gesture.

1993

Eble Campus Sl. Oct. 3: gig – make the obscene gesture of projecting the middle finger at another. ‘Did you just gig that obnoxious cheerleader?’.