(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
by Sinista01 September 13, 2011
''Naughty 40'' group of hardened football hooligans from Stoke on Trent who follow Stoke City Football Club. Much feared and respected from other hooligans around the country.

Though called the Naughty 40 , it is believed its membership has well in excess of 3,000 members!

read the book entitled by the same ''Naughty''

''we're Naughty , we're 40, we're off our f*cking heads''
The naughty 40 are here..

Have you seen the Naughty 40?

who is a member of the Naughty 40?
by Speedball April 07, 2006
A collection of undernourished scallywag types and overweight middle aged beer monsters who like to think of themselves as hard men, when in actual fact they're about as threatening as a feather duster.
"That naughty 40 turned up at another FC UNITED of MANCHESTER match looking for trouble again, but they just made complete fools of themselves as they ran away, after making a laughable attempt at storming into us."
by Red Dan September 05, 2007

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