0 past simple and past participle of diddle --
1 to get money from someone in a way that is not honest: --
I checked the bill and realized the restaurant had diddled me out of £5.
He diddled me! He said that there were six in a bag, but there were only five.
2 to work with something in a way that is not serious, or to play with something: --
3 to have sex with someone: --