1. tv. to feel someone sexually. (see also feel someone up. Usually objectionable.) She moved her hand over, like she was going to diddle him, then she jabbed him in the crystals.
2. in. to masturbate [oneself]. (Usually objectionable.) Have you been diddling again?
3. tv. to masturbate someone else. (Akin to sense 1 Usually objectionable.) She diddled him since it was his birthday.
4. tv. to cheat someone. The shop owner diddled me out of ten bucks.
5. tv. & in. to copulate [with] someone. (Usually objectionable.) I’m tired of hearing who has diddled whom in Hollywood.