Green’s Dictionary of Slang

1. to copulate.

1680		M. Stevenson Wits Paraphras’d 108: But she’s no Greek, ah, can you rump it, / With such a lewd Barbarian strumpet?
1771		Smollett Humphrey Clinker (1925) I 7: I know that hussey Mary Jones loves to be rumping with the men.
1966		Trimble 5000 Adult Sex Words and Phrases 178: rump the cula (Vulg.) 1. To Copulate with a female from the position of Venus Aversa.
1975		‘P.B. Yuill’ Hazell and the Three-card Trick (1977) 37: I’d only been rumping her as part of the job.
1983		R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].
2004		(con. 1990s) N. ‘Razor’ Smith A Few Kind Words and a Loaded Gun 472: Yeah, I’d rump Edwina Currie, but I draw the line at Maggie Thatcher.

2. to turn one’s back on as a deliberate social snub.

c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: To Rump any one; to Turn the Back to him: an Evolution sometimes used at Court.
1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn).
1814		G. Colman Yngr Poetical Vagaries (2nd edn) 129: He rumps us quite, and won’t salute us [F&H].
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1824		History of Gaming Houses & Gamesters 51: For what precise misdeed he got rumped at C—n-house [is] uncertain [...] 53: Wehn the subject to be rumped (or cut) approaches the great man, the latter eyes him over from top to toe [...] and our subject wretch raiseth his downcast eyes [...] and discovereth nought but the royal rump presented to his view.
1840		R. Barham ‘Lay of the Old Woman Clothed in Grey’ in Ingoldsby Legends (1842) 265: His Holiness not only gets the ‘cold shoulder,’ / But Nick rumps him completely, and don’t seem to care a / Dump – that’s the word – for his triple tiara.
1873		Sl. Dict. 273: Rump to turn the back upon any one. A still more decided ‘cut direct’ than the ‘cold shoulder.’.

3. to flog.

1812		Vaux Vocab. of the Flash Lang. in McLachlan (1964) 262: rump’d: flogged or scourged.
1837		Southey Selections from the Letters IV 501: An old friend rumped him, and he winced under it.
1843		Satirist & Sporting Chron. (Sydney) 25 Feb. 2/2: Jemmy— I’ll bet you a rump and dozen we do. Sam— No, I never bet Rumps and Dozens. I’ve been rump’d too often myself.

4. (US) to have anal intercourse.

1980

Maledicta IV:2 (Winter) 198: Should the man remain superior, but the woman turn prone, he is said to rump her.

5. used fig. for fuck v. (2a)

1996		J. Cameron It Was An Accident 54: Fuckin’ old bats chipped me 2p on the coffee then tried rumping me on the change.
2000		J.J. Connolly Layer Cake 207: Jimmy’s been rumped for thirteen million quid by a loda East European grafters.
2007		N. ‘Razor’ Smith Raiders 288: I think Budgie got well and truly rumped.