(British Street Slang) 1 gram of Crack Cocaine. £40 is the price of 1 grams worth of crack. Smoking Crack is often frowned upon hence the word naughty.
Person 1: How much do you think I would have to pay him to rob me that car?
Person 2: He's a junkie mate, he would probably do it for a Naughty 40
Prices shown in USD.
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