Meaning
A cigarette, or a rolled spliff — slang for a smoke. Strongly associated with UK-Jamaican road and drill speech that grew out of the reggae diaspora, 'blem' has become common in British youth slang while keeping its Jamaican roots. 'Spark a blem' means light a smoke, and the word belongs to the newer, transatlantic layer of the language, where terms travel back and forth between Jamaica and its communities abroad, taking on fresh life in London as much as in Kingston.
Examples
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Him step outside fi a blem.
He stepped outside for a smoke.
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Pass mi a blem, nuh.
Pass me a cigarette, won't you.
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Dem spark up a blem after di dance.
They lit up a smoke after the dance.
Origin
UK-Jamaican slang for a cigarette/spliff, of uncertain origin, spread through the reggae/road-culture diaspora.
How it’s used
Slang for a cigarette or spliff; chiefly UK-Jamaican. Compare 'grabba', 'spliff'.