Somewhat crumbly or of poor quality; slightly unpleasant or undesirable.
From 'crum' or 'crumb' with the informal diminutive and quality-indicating suffix '-ie' (or '-y'), common in casual English speech to create informal adjectives suggesting something is mediocre or unpleasant.
The suffix '-ie' is incredibly productive in British English slang—it turns serious words into casual ones, so 'crummie' feels more playful and dismissive than a formal adjective would.
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