Usually applies to someone who thinks they have DJ skills because they bought serato and downloaded a bunch of mp3s,
rather than actually learning how to cut, beatmatch, etc. Comes from the idea of a microwave being very quick, but not so good.
-That guy downloaded some generic house music and a torrent of Traktor, and now he thinks he’s ready to play at clubs.
-No way, he’s a total Microwave DJ.