Etymology

fatberg

fat·berg
F4A1T1B3E1R1G2

Today it means: A large accumulation of fat and discarded toiletries which clogs sewers. Full definition →

First used the late 2000s.
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The story

From fat + berg, modelled on iceberg. By surface analysis, fat + -berg.

First known use, by meaning

  • From the late 2000s. A large accumulation of fat and discarded toiletries which clogs sewers.

Etymology from Wiktionary, CC BY-SA 4.0.