Green’s Dictionary of Slang

1. (Aus., also gouey) a lump of phlegm.

1919

W.H. Downing Digger Dialects 27: gouey — Saliva.

2. a man of weak character; a fool.

1906		E. Dyson Fact’ry ’Ands 165: Half ther ’ouses in town ’ud give er gooey iv that sort er billet rather ’n’ take on er lad with er tizzy’s worth iv grit in him.
1911		E. Dyson ‘Dukie M’Kenzie’s Dawnce’ in Benno and Some of the Push 32: But only a confirmed chump and irremediable ‘gooey’ comes up for a third ‘chuck.’ [Ibid.] ‘Jest jollyin’ these gooeys, tha’s how,’ he said.

3. a pretty girlfriend.

2001

P. Herbst Wimmin, Wimps and Wallflowers 149/2: gooey, an adolescent usage meaning girlfriend.