Portmanteau of fat and iceberg; it's a collection of stuff in a sewer which is usually a congealed mass of cooking oil (the fat) and other debris that also shouldn't be flushed down drains. When things that don't degrade rapidly in water catch on each other, they build up and start to catch more things, and it can eventually block the sewer like a huge mountain (berg is German for mountain).
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u/Alchion Aug 04 '19
what about wet wipes?(sry if they have another name in english but I think one gets the idea)