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UK slang: "I've got nothing." or "Nothing came of it."
I think it comes from something like 'couldn't even get a drink at the pub, just left with some stolen mustard pacs'.
Did you get the (job/girl/money/news)?... Nah; "pocketful of mustard."
by RichieRichie January 16, 2007

Words related to Pocketful of Mustard

came up empty. i got nothing i've got nothing nada zip-zero-zilch