Something with absolutely no use or function.

Something that does not work.
These scissors don't do diddly dick!
by AVGNfan May 31, 2009
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It's that noodle between yo thighs. Most common in men. Exceptions include Donald Trump.
Adon : Bang avec les plus petit pénis dans le monde!
Ragz: LOOOOOOL
Sid: I'd laugh too if I knew what that meant
Ragz: It means "Bang has the smallest diddly dong in the world"
by FapGod December 18, 2015
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diddly squat ain’t but nuthinat all
I had DIDDLY SQUAT to do with selling all that gay pornography to those terrorists!
by BillieJeanIsNotMyLover August 19, 2019
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Wow, Rachel's diddly-do is a freakin bush! When was the last time she shaved?
by Gigi Coker July 21, 2017
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Zero, nothing, nada. Sometimes used during post-game press conferences to describe the performance of the team, particularly on offense.
"We didn't do diddly-poo offensively." --Jim Mora Sr.
by J-Smoove May 30, 2006
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A word used to describe a happy moment when completing an action or goal. It is often said in a southern accent, and it was created 2021-02-19 by a really cool guy.
by BuddyDooWhat February 20, 2021
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A penis with only a head and no shaft.

Similar to a Chode

When Anthony asked his girlfriend to "work the shaft", she laughed and made him cum.
1: Anthony's girlfriend can't give him a proper blow job because he has a Chode Diddly

2: Can be used on its own even when someone with a Chode Diddly is not present.
Ex. Usually used when ecstatic. "CHODE DIDDLY!"
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