on the grog

From on (“regularly taking”) + the + slang grog (“any alcoholic drink”).

on the grog

1. (Australia, slang) Drinking alcoholic beverages to excess.

   Synonyms: on the piss, on the sauce, on the turps

   • 2007, Amanda Astill, Tom Bromley, Michael Moran, Simon Trewin, Shopping While Drunk: Confessions from Modern Life, London: John Murray, →ISBN, page 157:

     After a fine night on the grog, with bladder pressures reaching an estimated 4,000,000 psi (estimated by drunken scientists), the comparatively short range marksmanship required of an in-sink micturator is a significantly more approachable challenge than the tricky long yellow of the traditional method.

• Jonathon Green (2024) “on the grog adj.”, in Green’s Dictionary of Slang