Disk Jockey. =). In the "olden days," radio stations played music from vinyl records on turn tables. These were alternatively called disks. So, the disk jockey was the one who "jockeyed" the disks...
Disk Jockey Disk Jockey
Well, he is a DJ and his name is Adam Michael Goldstein. A from his first and M from his middle name 'AM'. That's what DJ AM stands for.
the DJ's name is Adam Goldstein so AM is short for Adam
Disc Jockey