Green’s Dictionary of Slang

(Aus.) to run off, to leave quickly.

1873		Sl. Dict. 185: Guy to get away. Same as hedge in street phraseology, which see.
1882		Sydney Sl. Dict. 5: Guy Avack - To Run.
1885		Bulletin (Sydney) 17 Jan. 12/1: And it is just to hand, the new crack prima donna […] had a tiff with her manager, and, at a minute’s notice, ‘guyed a whack to her own Medina’ – which means London […].
1892		‘Fanny Flukem’s Ball’ in Bird o’ Freedom (Sydney) in J. Murray Larrikins (1973) 40: The Tempe blokes just stopped one each / And then they guyed a whack. / ‘It isn’t on our programme / And, Gor’ bli’ me we are Jack.’.
1895		Crowe Aus. Sl. Dict. 34: Guy-a-Whack, to run away.
1899		A. Binstead Houndsditch Day by Day 90: Dey gets pack an’ finds dat de letter-writin’ cabtain has guyed vit’ de pot.
1900–10		Stephens & O’Brien Materials for a Dict. of Aus. Sl. [unpub. ms.].
1901		Sydney Sportsman (Surry Hills, NSW) 27 Feb. 6/6: So as they can do a guy in, / Do a bloomin guy awhack.
1999		G. Seal Lingo 147: Cheats when discovered usually had need to run quickly away, a practice that generated such arresting terms as guy-a-whack, do a guy, clear out and shirock.