Basically, it means to have sex, it is usually used when the situation is awkward.
Dude: would you like to... U know... Dip the diddly do?
Girl: Sure!
by ShopMrbeast.com November 26, 2018
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Having a diddly dack is another saying for masturbation, like flicking the bean or jerkin the jerkin, you're having a diddly dack.
bob was in the bathroom having a diddly dack over fred's sexy ass.
by The real jesus December 12, 2013
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used by gloucester natives this word is used in reference to something being "sick" or being very good at something.
yo b did you see the game last night? Brady is diddly dirt kid.

yo them shoes are diddly dirt dude.
by mike forgette January 28, 2008
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The little springs and parts of a break drum, on an '84 merc Marquis
"Ah, gotta wake up tomorrow and work on my diddly doods"
by CaptinDucky August 6, 2008
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Being so buzzing that you start to talk without reason or meaning.
"Dude josh was so fucked last night I swear he was diddly possing all night"
by Skinceclayton February 21, 2014
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(noun), a term used as an alternative word for sex, or someone who has a lot of sex
"wow! Kaden probably fiddles so many diddlies!"
"Dude, your such a diddly fiddler!"
by quakeden January 14, 2017
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