To flash the ash means to offer someone a cigarette from your pack — sharing your smokes with a mate or passing one along when asked. The phrase is a piece of British slang with a satisfying rhyme to it, and it carries the casual generosity of cigarette culture where sharing a smoke was a social ritual. The 'ash' refers to the ash end of a lit cigarette, and 'flash' suggests a quick, casual offer. It's dated but charmingly evocative of a very specific era of British pub and street life.
Go on, flash the ash — I left mine at home and I'm gagging for one.
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(slang) To give somebody a cigarette.
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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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