fatberg

Etymology

From fat +‎ berg, modelled on iceberg.

Noun

fatberg (plural fatbergs)

1. A large accumulation of fat and discarded toiletries which clogs sewers. [From late 2000s]
   • 2009, Carlos J. Cortes, The Prisoner‎, page 162:

     Months ago a tunnel was clogged with a fatberg. It took a team of workers a month to move it.

   • 2013, Russ Litten, Swear Down, unnumbered page,

     Bleeding big fatberg up there. About half a ton's worth.

   • 2014, Adam Roberts, Bête, unnumbered page,

     Then I worked in the sewers of Manchester–a six month stint of that, jabbing pressure-water-poles at fatbergs, tonnes of used kebab grease and congealed sump oil, woven together with thousands of used wet wipes.