Green’s Dictionary of Slang

1. anything excellent, first-rate.

1941		Baker Popular Dict. Aus. Sl.
1945		NZEF Times 29 Jan. 2: What a rumpty [DNZE].
1955		N. Pulliam I Travelled a Lonely Land (1957) 238/1: rumptydooler – fine, first-class.
1964		E. Wier [bk title] The Rumptydoolers.
1988		McGill Dict. Kiwi Sl. 94: rumty excellent person or thing.
1999		Beaut Little Book of N.Z. Sl. n.p.: Rumpty dooler – anything fine or superior.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].

2. (also rumpty dollar) a fuss, an uproar.

1944		Maurer & Baker ‘“Aus.” Rhyming Argot’ in AS XIX:3 195/1: Rumpty Dollar. A holler (cry).
1974		in R.H. Morrieson Predicament 21: [inscription on flyleaf of a schoolboy’s text book] Stay for me, / I shall not fail / To meet you in that hollow vale, / But what a rumpty there will be / If thou shouldst bring this book with thee!