Green’s Dictionary of Slang

not give a tuppenny damn v.

[apparently coined or popularized by the Duke Of Wellington (1769-1852)]
also ...a tuppenny cuss, ...a twopenny damn, ...two tuppeny turds
[for ety. see not give a damn v.]

to not care at all; occas. not matter a tuppenny damn.

[US]Macaulay letter to Mr Ellis, in Life II 257: How they settle the matter I care not, as the Duke says, one two-penny damn.
[Scot]Dundee Advertiser 14 Sept. 3/7: I don’t care a twopenny d—n what they say [...] What is a twopenny d—n.
[US]Nation 49 68: An obscure Cork Orangeman named Wilson, for whose opinions on the question [...] nobody would give what the Duke of Wellington used to call ‘a tuppenny damn’.
[Scot](ref. to mid-19C) Glasgow Herald 24 Nov. 24 Nov. : The Duke of Wellington’s ‘tuppenny d—n’ was as familiar thirty years ago as his aqualine visage.
[Scot]Eve. Teleg. (Dundee) 13 Feb. 1/4: I don’t care a ‘tuppeny damn’ to quote Lord Randolph Churchill.
[Scot]Dundee Courier 23 Apr. 2/4: We need not therefore care a ‘tuppenny damn’ for a mere handful of pacifists.
[UK]Hull Dly Mail 31 Oct. 9/3: An Independent was a man who did not care ‘a tuppenny damn’ for any person and did what he thought was right.
[Aus]K. Tennant Foveaux 130: He didn’t care a twopenny damn if they were building straw huts.
[UK]G. Kersh They Die with Their Boots Clean 143: For my part I don’t care a tuppenny damn.
[UK]Hull Dly Mail 23 Nov. 1/8: Do you know or care whether he has won or lost [...] it does not matter two twopenny damns to me.
[UK]Picture Post 13 Nov. 14: She doesn’t give a tuppenny cuss for glamour.
[US]J.P. Donleavy Ginger Man (1958) 165: Maybe I could have been a big fella with cars and maids but I don’t give two tuppeny turds.
[UK]W. Hall Long and the Short and the Tall Act I: Do you think I give a twopenny damn about his life?