Green’s Dictionary of Slang

doodle-sack n.1

[Ger. Dudelsack bagpipes; ? ult. SE tootle]

(Scot.) a bagpipe.

[UK]Grose Classical Dict. of the Vulgar Tongue ms. additions .
[UK]Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn).
[UK]Lex. Balatronicum.
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.