Thames Water has recently removed a giant 'fatberg' from a West London sewer, reminicent of this monster in 2010. Courtesy Thames Water/County Clean

IF you tip hot fat down your kitchen sink, poke food down the drain or put moistened towelettes down the toilet, this is what is likely to happen.

Residents in West London were baffled as to why their properties were flooding until the cause was identified as a ‘fatberg.’

EARLIER: There could be a fatberg lurking under your home

The massive stinking pile of filth was the length of a Boeing 747 aeroplane and was jammed in sewers beneath people’s homes.

Staff from Thames Water found the gargantuan blockage when they checked beneath the 80 metre long section of road in West London.

The congealed mess was made up of waste fat, wet wipes, food, tennis balls and planks of wood, among other bits of debris.

It took workers at least 4 days to clean it up.

“We spend 12 million pounds a year tackling blockages, most of them formed because people have tipped cooking fats down the drain and wet wipes down the loo,” Dave Dennis, Thames Water sewer operations manager told The Mirror.

“The sewers serve an important purpose — they are not an abyss for household rubbish.

“Fat goes down the drain easily enough, but when it hits the cold sewers, it hardens into disgusting fatbergs that block pipes.”

This was not the first time Thames Water had to remove such a mass of coagulated fat. A bus-sized ‘fatberg’ was discovered under a London street last year.