To totter, as a child in walking.
- Slang To cheat; swindle: "The Swiss have special laws for people who diddle hotels” ( John le Carré).
- To jerk up and down or back and forth.
- Vulgar Slang To have intercourse with (a woman).
- Vulgar Slang To practice masturbation upon.
- To shake rapidly; jiggle.
- Slang To play experimentally; toy: The children diddled with the knobs on the television all afternoon.
- Slang To waste time: diddled around all morning.