Plural of 'diddy'; British slang for small or insignificant things, or informal for small amounts of money or objects.
From 'diddy,' which itself may derive from 'diddle' or be a reduplicative diminutive formation similar to 'tidbit.' The exact origin is uncertain but relates to smallness or insignificance.
British slang is full of these playful diminutives—'diddies,' 'biggies,' 'goodies'—where adding '-ies' to adjectives or verbs creates noun forms that feel informal and friendly, perfect for colloquial speech.
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