Green’s Dictionary of Slang

dub n.8

[? link to dub v.1 , i.e. it ‘shuts up’ one’s mouth or northern dial. tab, a cigarette]

1. (US, also dubber) a cigarette.

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[US]G. Underwood ‘Razorback Sl.’ in AS L:1/2 58: I need to buy a pack of dubs. [Ibid.] 58: dubber n Cigarette.

2. (US drugs) a marijuana cigarette.

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[US]Noreaga ‘Da Hustla’ 🎵 Comin out the hood, we aint have too many choices to live / niggas hustled tryin to duck bids we learned as kids / how to sell drugs, cook grams, and get dubs young thug.
[US]W. Shaw Westsiders 75: Bailin’ through the party with a pound of bud / All sacked up in straight dimes and dubs.

3. (UK drugs) cocaine or crack cocaine.

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[UK]Observer 9 Oct. 🌐 ‘He wants four 10-bags of dubs and four 10-bags of B.’ Dubs? B? ‘Dubs are white drugs – crack and cocaine’.