Green’s Dictionary of Slang

mook n.²

In phrases

do a mook (v.) [? mooch n.¹ (3)]

(Aus.) to go to.

1908

Bulletin (Sydney) 30 July 14/2: ‘Enny’ow,’ continued Ponto, ‘Shinner King’s lug gittin’ t’ ’ear ’iv th’ razzle, done a mook t’ th’ John ’ouse, ’n’ ’ooked me tart inter th’ starlight.’.