Please explain the answer of a joke: "hors d'oeuvre"

etymology british-english humor

This was part of the Uxbridge English Dictionary part of ISIHAC (I'm sorry I haven't a clue). The word was 'hors d'oeuvre' and the definition was 'ladies who hang around diesel pumps'. I don't get it.


Solution 1:

"Hors d'oeuvre" is a pun on "whore DERV". Whore is fairly obvious, and DERV is a [UK] acronym for "Diesel-Engined Road Vehicle". In the UK, when diesel cars were uncommon, diesel fuel pumps for lorries (trucks) used to be labelled DERV.

Actually, the pun is the other way round. Never mind.

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