(slang, dated, mostly in the phrase 'like billy-oh') The greatest extent or degree of something; used in comparisons to indicate a superlative.
I bashed my thumb with a hammer, and it hurts like billy-oh.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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