A mildly vulgar slang phrase meaning absolutely nothing — a more emphatic version of 'nothing at all,' used to express frustration or dismissiveness. Functionally parallel to 'bugger all' or 'sod all' in British registers. Typically deployed when someone has received nothing, achieved nothing, or been left with nothing after an effort.
I waited for two hours and got jack all for it.
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(mildly, vulgar, slang) Nothing.
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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.
See all Regional & Other slang on Slangora.