In percussion, two consecutive notes played by the same hand (either RR or LL), similar to the drag, except that by convention diddles are played the same speed as the context in which they are placed.
From dialectal duddle (16th century), duddle (17th century); perhaps influenced by the name (which itself was probably chosen as an allusion to duddle) of the swindling character Jeremy Diddler in Kenney's Raising the Wind (1803). Meaning "to have sex with" is from the 19th century; "to masturbate" is from the 1950s. Compare dildo.
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