You mean DJ AM, you moron? Of course I have! He's a legend!
The phonetic pronunciation of the abbreviation "DJ", which originated with the term "Disk Jockey," from the job description of radio personalities who would "jockey" the "disks" - 45 rpm LP's at first, and later on, CD's - at radio stations. In the early 1970s, with the rise of hip-hop culture and the Universal Zulu Nation, it became synonymous with the practice of "scratching," originated by the DJ Grand Wizard Theodore, of New York City. It is one of the four key elements of hip-hop.
See also MC.