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3.
dartford slang for crap morrocan hash
i rather go without
by les nolan December 28, 2003
 
1.
Diesel fuel intended for use in road vehicles and taxed accordingly. British English. Pronounced "durv" to rhyme with curve. Originally an acronym for Diesel Engined Road Vehicle.

Background: Diesel fuel in Britain is supplied in two forms, derv for road vehicles, and cheaper, lower-taxed "gas oil" or "red diesel" for boats, generators, agricultural equipment, construction plant and other non-road use. The two forms are coloured and chemically tagged to enable inspectors to distinguish between them. The tags can be detected in *extremely* small concentrations, and the use of gas-oil in a road vehicle is an offence punishable with *very* heavy fines (Hell hath no fury like a government denied tax revenue).
The price of a gallon of derv has gone up again.
by RB1956 March 25, 2008
 
2.
Derv- 1 A person who is very unreliable, untrustworthy.

2 A person who always rips people off; usually on drugs
Yo fool you need some nug?
Fuck you Derv!
by Streetratderv April 07, 2010