Green’s Dictionary of Slang

1. as rort at, to shout, to complain loudly, to shout abuse.

1935		M. Harrison Spring in Tartarus 327: It isn’t you, Holy Jesus, that I’m rorting at.
1943		J. Phelan Letters from the Big House 39: He shouldn’t rort for a snot-rag to wipe his nozzle.
1962		W. Granville Sailors’ Sl. 97/2: Rort, to shout in argument or act truculently when charged with indiscipline... In Cockney Slang to rort is to ‘shout the odds.’.
1980		Barltrop & Wolveridge Muvver Tongue 95: To speak loudly and in anger is to ‘rort.’.

2. to have sexual intercourse; thus rorting n.

1960		J. Walker No Sunlight Singing (1966) 196: I hear all these old hands talking about gin rorting, as if it’s the national sport in the Territory.
1973		(con. 1940s–60s) Hogbotel & ffuckes ‘Sixpence’ in Snatches and Lays 37: Four-and-twenty prostitutes a-riding on a bus, / Fucking in the corridors, rorting on the stairs.
2003		McGill Reed Dict. of N.Z. Sl. 175: rort [...] is generally about political chicanery but, before that, was used to mean sexual intercourse or the female object thereof. Derived from British ‘rorty’, splendid, rowdy or coarse. ANZ.

3. to go out on a spree.

1956		J.E. Macdonnell Commander Brady 249: Now don’t forget. Nobody grogged up. Nobody rortin’ it up with them Yanks.
1981		D. Stuart I Think I’ll Live 179: I got to be mates with him, out dancing, shielah rortin together.