shock jock 
noun informal
A disc jockey on a talk-radio show who expresses opinions in a deliberately offensive or provocative way: a right-wing American shock jock...
- This is a shock jock whose opinions are at odds with a media brand that prides itself on diversity.
- The shock jock leaves the FM radio station today for satellite broadcast.
- And the radio shock jock has built his career based on the government's repeated decision not to go after him for ‘indecency.’