Green’s Dictionary of Slang

1. to beat hard on the buttocks; also in fig. use; also as n.; thus also bumbasting n.; bumbaised/bumbazed adj.

1567		R. Edwards Damon and Pithias (1571) Eiiii: I shal bumbaste you, you mocking knaue.
1581		B. Riche Farewell to Military Profession (1992) 256: He laid on his cudgel, sparing neither head, shoulders, arms, back nor breast, and so be-bumbasted the doctor.
1600		Look About You xxx: I’ll bu-bumbast you i’faith.
1610		Rowlands Martin Mark-all 40: The muggill will tip you fat scraps and glorious bits, the Beadle will well bumbast you.
1621		T. Fitzherbert Reply to D. Collins his Defence of Lord of Winchester Dedication x: All this so bumbasted with the vaine ostentation of Greeke, pedanticall phrases, thrasonicall brags, and triumphant exaggerations.
1639		R. Davenport New Tricke to Cheat the Divell III i: I have bumbasted the Devill.
1640		H. Glapthorne Wit in a Constable V i: Here lets canvas This Quart, and then will bumbaste off another.
1653		Urquhart (trans.) Gargantua and Pantagruel (1927) I Bk II 331: I have bum-basted four hundred and seventeen, since I came into this city.
1696		J. Dunton Night-Walker Oct. 7: The frightening of Cullies, bumbasting of Whores, wringing off Knockers, burning Signs with Torches [...] were actions far below us who were men of Fancy, Sense and Wit.
1722		Benefit of Farting 1: Wrote in Spanish by Don Fart-in-hand-o Puff-in-Dorst, Professor of Bum-bast.
1817		W. Scott Rob Roy (1883) 261: Conscience! if I am na clean bumbaised – you, ye cheat-the-wuddy rogue.
1822		R. Nares Gloss. (1888) I 119: bumbaste. A jocular word for to beat, or baste.
1856		J. Strang Glasgow and Its Clubs 521: O Mr. S. you are bumbazed!

2. to have sexual intercourse, esp. in the ‘rear position’; thus bumbasting n.

1653		Urquhart (trans.) Rabelais II 15: I have bumbasted four hundred and seventeen, since I came into this City.
1680		M. Stevenson Wits Paraphras’d 48: The storm’s so high, it can’t be lasting; / Then once more venture a Bumbasting.
1888–94		‘Walter’ My Secret Life (1966) I 198: I knew she had had a bumbasting before [...] but even she made a fuss one night when I wanted to fuck her with her bum towards my belly.
1896		Farmer Vocabula Amatoria (1966) 252: thermométriser. To copulate; ‘to bumbaste’.

3. to beat, to assault.

1984

Partridge DSUE (8th edn) 153/2: from ca. 1860.