Green’s Dictionary of Slang

bumbo n.1

also bombo
[ety. unknown; OED notes Ital. bombo ‘a child’s word for drink’]

a drink composed of brandy, sugar and water.

[UK]Smollett Roderick Random (1979) 192: His mess-mates, who were making merry in the ward-room, round a table well stored with bumbo and wine.
[UK]Diary of a Sussex Tradesman in Sussex Arch. Collection IX p.188, cited in N&Q 28 April Ser. 7 I 194: We drank one bowl of punch and two muggs of bumboo [F&H].
[UK]Grose Classical Dict. of the Vulgar Tongue.
‘The Return of Ulysses to Ithaca’ in Sonneck Yankee Doodle (1909) 215: Yankee doodle doodle doo black Negro he get fumbo, / And when you come to our town, we’ll make you drunk with bumbo.
[UK]C. Dibdin ‘The Lucky Escape’ in Collection of Songs II 129: I liked the jolly tars, I liked bumbo and flip.
[Ire] ‘The Irish Morsho’ in North Country Maid 3: My spirits I cheer’d with good wine and bumbo.
[UK]J. Bell Jr. (ed.) Rhymes of Northern Bards 286: They drank bumbo made of gin.
[UK]W.H. Smyth Sailor’s Word-Bk (1991) 117: Bombo, weak cold punch.
[UK]Sl. Dict.
[UK]Northumberland Song in N&Q 6 Mar. 195: The pitmen and the keelman... drink bumbo made of gin [F&H].