Dutch word etterbuil comes from Dutch buil (Bruise, bump.), Dutch etter ((figuratively) A rotten, nasty person. Pus.)

Detailed word origin of etterbuil

Dictionary entry	Language	Definition
buil	Dutch (nld)	Bruise, bump.
etter	Dutch (nld)	(figuratively) A rotten, nasty person. Pus.
etterbuil	Dutch (nld)	A localized accumulation of pus in the skin; a boil.