"Dear Rock listeners, we are gathered here this morning to unite John Philip Key and Bryce Anthony Casey," said producer Jeremy Pickford.
"John, do you promise to help Parekura Horomia lose weight next year?"
"I do," said Key.
"With the power of radio I pronounce you PM and DJ," Pickford announced.
Key then sealed the deal with a slap to Casey's backside, followed with the words: "That felt good".
Lastly, Key visited Radio Sport, and performed a brief re-enactment of Gangnam Style when asked by host Tony Veitch to show off his "best white man dance".
"I don't think I'm going to knock PSY off ... that's the way it goes," Key said afterwards.
This morning's performances aren't the first of Key's radio stints to attract attention this year.
The PM was widely criticised when he used the word "gay" to describe a red top worn by The Farming Show presenter Jamie Mackay during an interview.
- nzherald.co.nz