Green’s Dictionary of Slang

(UK Und.) the posterior, the buttocks.

c.1597		Shakespeare Henry IV Pt 2 II i: Away, you scullion! you rampallian! you fustiliarian! I’ll tickle your catastrophe!
1608		Middleton Merry Devil of Edmonton V ii: Body of Saint George, this is mine overthwart neighbour hath done this to seduce my blind customers. I’ll tickle his catastrophe for this; if I do not indict him at next assizes for burglary, let me die of the yellows.
1835		G. Kent Modern Flash Dict. 9: Catastrophe – behind, seat of honour.
1838		‘Paul Pry’ Oddities of London Life 5: The publican threatened to smack their catastrophes, and the little pleaders ran scared away.
1848		Flash Dict. in Sinks of London Laid Open [as cit. 1835].
1842		Whip & Satirist of NY & Brooklyn (NY) 1 Jan. n.p.: My dear girl, have you not some lump of a brother who could tickle the catastrophe of the false swain?
1922		Joyce Ulysses 72: I’ll tickle his catastrophe, believe you me.