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Nothing. Shortened version of "diddly-squat"
I sent my money in but I got diddly back.
by Matt October 07, 2003
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Manchester christened name for Extasy Tablets.
Eg 1.

Punter: Safe, You got any 'diddlies'?
Dealer: Yea yea, Blue Stars, Green Shreks or Some White Paul and Sharks. ยฃ2 a Pop.
Punter: Bang 5 Sharkies my way.

Eg 2.

Friend 1: You need any 'diddlies' for tonight?
Friend 2: Yea pick me up 3 when you get yours.
Friend 3: Safe!
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Slang term for deadlifts, a popular weightlifting exercise. Mainly used on the 4chan board /fit/.
I'm feeling pretty pumped after that heavy diddly set, fampai.
by SwoleYeti April 12, 2017
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A noticable part to a piece of art or music.
That was a nice little diddly they just played for us.
by satandracula November 25, 2009
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