Best definition
A german form that makes fun of Microsoft Windows (doof meaning stupid, silly) often used by Mac or Linux Users

Guy 1: Oh man mein Windows craht die ganze Zeit (Oh man my windows is crashing all the time)

Guy 2: Windoof ist ja auch scheisse, benutz ‘nen mac! ( That’s because Windoof sucks, use a mac!)

Guy 3: Haha, Mac ist genauso scheisse wie Windoof, benutz Linux! (Haha, Mac sucks as bad as Windoof, use Linux!)