Green’s Dictionary of Slang

doddies n.

[the proletarian version of society’s do-ut-des, from Lat. do ut des, I give in order that you may give back]

a selfish person.

[UK]J. Ware Passing Eng. of the Victorian Era 113/1: Doddies (Peoples’) Corruption of Do ut des; reduction of Doddies-man; e.g., ‘E’s a doddies – give a sprat to catch a herring any day in the week, and any hour.’.