There are 2 definitions of diddy in English:

diddy1

Line breaks: diddy

Entry from British & World English dictionary

noun (plural diddies)

British informal
A fool: what a diddy!

Origin

late 18th century: alteration of titty.

Definition of diddy in:

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Word of the day impudicity
Pronunciation: ˌimpyəˈdisitē
noun
lack of modesty

There are 2 definitions of diddy in English:

diddy2

Line breaks: diddy

Entry from British & World English dictionary

adjective

British informal
Little: a little diddy baby hedgehog

Origin

probably a child's corruption of little.

Definition of diddy in:

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Word of the day impudicity
Pronunciation: ˌimpyəˈdisitē
noun
lack of modesty