DAU /dow/ [German FidoNet] n. German acronym for
D"ummster Anzunehmender User (stupidest imaginable user).
From the engineering-slang GAU for Gr"osster Anzunehmender
Unfall, worst foreseeable 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}.