DAU: /dow/ n. [German FidoNet] German acronym for Du"mmster
Anzunehmender User (stupidest imaginable user). From the
engineering-slang GAU for Gro"sster Anzunehmender Unfall, worst
assumable accident, esp. of a LNG tank farm plant or something with
similarly disastrous consequences. In popular German, GAU is used
only to refer to worst-case nuclear acidents such as a core
meltdown. See cretin, fool, loser and weasel.