(名詞) (下水道的) 巨型油脂塊；油脂山 － 民眾將廚餘、濕紙巾、尿布、排泄物及其他廢物直接倒入水溝或馬桶的結果，因積存多時而凝固成塊狀，看起來跟水泥塊沒什麼區別。這個字是由 fat (脂肪) + iceberg (冰山) 拼綴而成。
Enormous clusters of wet wipes are creating “fatbergs” that are clogging up sewer pipes across NSW, including a one-tonne cluster that blew out a pumping station near Lake Macquarie.
—Gabriel Wingate-Pearse & Glen Humphries, “Fatbergs: One tonne balls of wet wipes and fat block sewers,” The Sydney Morning Herald, February 25, 2016
First, someone might pour molten turkey fat down a drain. A few blocks away, someone else might flush a wet wipe down a toilet. When the two meet in a dank sewer pipe, a baby fatberg is born.
—Erika Engelhaupt, “Huge Blobs of Fat and Trash Are Filling the World’s Sewers,” National Geographic, August 16, 2017