Furious Frenchmen are threatening to turn the Seine into a sewer this Sunday in a bizarre protest against the eye-watering costs of Olympic preparations.

The movement, cheekily dubbed #JeChieDansLaSeineLe23Juin (I'll poo in the Seine on June 23), has gained traction after Paris Mayor Anne Hidalgo boasted she'd take a dip to prove the river's cleanliness.

Hidalgo, however, has now back-pedalled on her pledge, conveniently citing the hastily-called French elections as reason to postpone her plunge.

A staggering £1.2 billion has been poured into purifying the Seine for Olympic swimmers and triathletes, as the river prepares to host key events during the Games.

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With just five weeks until the Games, recent tests revealed alarming levels of two types of faecal bacteria, including E.coli, falling short of Olympic standards.