Radio host is sacked after explicit stunt involving Australian Prime Minister Scott Morrison

Scott Morrison shared this image with a FM radio crew - not noticing the mug. Photo / Instagram

A radio host has been sacked following a cheeky stunt involving Prime Minister Scott Morrison and the C-bomb.

After a probing interview on Wednesday which involved Hit FM Cairns broadcaster Shad Wicka asking the PM if he ever had "a peek" at others while using the urinals in Parliament House, the host posed alongside Morrison for a photo.

Morrison then shared the snap to his own Instagram story feed, not noticing the message painted on Wicka's explicit mug — a cup with the C-bomb emblazoned on it.

It's now believed Wicka has been sacked from the Southern Cross Austereo radio network, with Cairns general manager Richard King telling the Cairns Post "appropriate action has been taken".

"Southern Cross Austereo sincerely apologises for the actions of Shad Wicker, host of Cairns Hit Network breakfast show, last Thursday," he said.

"This conduct is not acceptable and does not live up to the social and moral code of conduct that we endorse and expect from all our people.

"We have investigated this matter thoroughly and can confirm appropriate action has been taken."

Coincidentally, the prank went to air during Wicka's last week at the Cairn's radio station, and the comedian was set to host a new show on SCA's 2GO and Triple M in Gosford.

Scott Morrison shared this image with a FM radio crew - not noticing the mug. Photo / Instagram

The photo shared by the PM quickly went viral before it was taken down.

"Chatting with Shad and Carly at Hit FM Cairns," Morrison wrote on the image, followed by an emoji of a microphone.

On their own, the letters U, N and T painted on the outside of the cup are meaningless, but the painted handle preceding them, in the shape of C, makes the message fairly clear.

The mug in question held by a Queensland FM radio host. Photo / Instagram

After social media users noticed the C-bomb cup and began sharing it widely, the image was suddenly removed from Morrison's feed.

But Wicka took to his own account to keep the gag going, posting the PM's original picture as well as a close up of the offending mug.

During his last show at the Cairns station, the radio host farewelled long-time listeners, marking his last day on air at the Southern Cross Austereo-owned radio station.

"Thank you so much for putting up with me every morning," he told listeners. "It's been real. It's been really fun — exciting times."

Shad declined to comment about his motive or the social media reaction to the picture.