Something big or important; a person of significance or prominence.
Informal formation from 'big' + diminutive suffix '-y' (common in English diminutive formation like 'doggy' and 'kitty'). Originally mid-20th century slang, particularly in American English.
Biggy shows how '-y' suffixes can work backwards from their original intent—while '-y' normally makes things sound smaller and cuter (puppy, kitty), 'biggy' ironically uses it to refer to something important or large. It's slang that plays with linguistic expectations.
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