Green’s Dictionary of Slang

dudder n.2

[synon. Rom.]

(UK Und.) money.

[UK]P.H. Emerson Signor Lippo 85: From their talk you could tell they was all on the money making dodge – getting their dudder. [Ibid.] 91: My old man was a romany and got his dudder by chinay-faking and mush-faking.