Computer related, more widely known as an initialism meaning "Dumb-Ass User", but also less commonly known as the Hacker slang (correct sense of the word, meaning a geek-like person, not a cyber criminal) term DAU stemming from the German "Dümmster Anzunehmender User ", meaning stupidest imaginable user. (Source: The Jargon File)
Even a DAU would be able to use this program!
Gah! My Dad is literally the DAU when it comes to using a printer! He has no idea what he is doing.