fatberg
noun
fat·berg
ˈfat-ˌbərg
plural fatbergs
: a large mass of fat and solid waste that collects in a sewer system
The toxic lump of congealed fat and household waste—known as a fatberg—was 40 metres long and so heavy that it broke the 1940s-era sewer.—Rebecca Ratcliffe
Restaurants are a big contributor to fatbergs: Thames Water, the London utilities company, found nine out of 10 fast-food eateries lacked adequate grease traps to stop fat from entering the sewers.—Eve Watling
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Merriam-Webster unabridged
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