Green’s Dictionary of Slang

1. obstreperous.

c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: Rumbumptious. Obstreperous.
1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn).
1811		Lex. Balatronicum.
1822		Life and Trial of James Mackcoull 299: It was really unfortunate she had been so rumbumtious at first.
1859		Hotten Dict. of Modern Sl. etc. 83: RUMBUMPTIOUS, haughty, pugilistic.
1864, 1867, 1870		Hotten Sl. Dict. [as cit. 1859].

2. haughty.

1859		see sense 1.
1864, 1867, 1870		see sense 1.

3. (US gay, west.) looking for a sexual encounter.

2022

(con. late 19C) J. Nevins ‘Western frontier gay slang’ on Twitter 2 Mar. 🌐 ‘rumbumptious’ = someone who is on the prowl.