Green’s Dictionary of Slang

grog v.¹

(Aus.) to drink; thus grogging, drinking.

1824		in N.E. Eliason Tarheel Talk (1956) 275: Groging [...] he gets grogey.
1833		J. Jekyll Correspondence (1894) 318: Captain Ross [...] has dined and grogged with messmate William at Windsor .
1874		H. Mayhew London Characters 195: He dined there, he supped there, and he ‘grogged’ there.
1886		Tinsley’s Mag. July 53: [They] met, grogged, smoked and discussed the news of the day [OED].
1933		‘William Juniper’ True Drunkard’s Delight 227: He has been invited to [...] grog.
1963		A.S. Fleischman Venetian Blonde (2006) 212: I’m not even sure he was grogged up on Dago red.
1969		L. Hadow Full Cycle 143: Steve had been grogging with the steward.
1972		J. O’Grady It’s Your Shout, Mate! 85: Leave it to the Abos and the TI boys [...] Thursday Islanders. Mad bastards when they get a few grogs on.
1974		D. Ireland Burn 32: Probably like his old man and grogged the lot.

In compounds

grog-up (n.) (also grogging on, grog-on)

(Aus./N.Z.) a drinking session, a party.

1960		A. Seymour One Day of the Year (1977) II iii: It’s just one long grog-up.
1967		J. Hibberd White with Wire Wheels (1973) 194: We’re all going up to the hills for a grog-on tomorrow.
1971		F.J. Hardy Outcasts of Foolgarah (1975) 188: An invitation to a grog-on.
1999		G. Seal Lingo 48: Then there is grogging on, grog artist, on the grog and a grog up.
2001		(con. 1945–6) P. Doyle Devil’s Jump (2008) 126: Jack Davey and his socialite crew might be there for some after hours grogging on.

In phrases

grog up (v.) (also grog on)

to drink heavily, to drink to excess.

1955		A. Marshall I Can Jump Puddles 178: It’s the kid who never sees men grogging up who takes to it when he grows up.
1968		S. Gore Holy Smoke 90: And if you try tellin’ me that ‘shicker’ isn’t a Bible word [...] take another look. It’s a Hebrew word meaning to grog on.
1976		R. Morrieson Pallet on the Floor 49: If you didn’t grog on regardless you could fix me up yourself.
1977		in K. Gilbert Living Black 303: When a man grogs up his kid’s food money you straighten him out.
1981		G. Johnston Fish Factory 107: Justice must be seen to be done, but it definitely shouldn’t be seen grogging up with the people it had just inflicted punishment on.
1986		C. Bowles G’DAY 49: The average Australian likes nothing better than to ‘grog on’ with his mates.
2003		McGill Reed Dict. of N.Z. Sl. 93: grog on/grog on regardless Drink persistently. ANZ.