Political adverts claiming Sen. Pauline Hanson is a mind reader have been challenged by Yorta Yorta rapper, who tells her what he really thinks on the back of one of her billboards.

On his regular segment on ABC's The Weekly with Charlie Pickering last night, Briggs said he was motivated into action after seeing a One Nation billboard near his home town in Victoria.

“There she’s saying ‘I’ve got the guts to say what you’re thinking’", Briggs explained.

"Which is a polite way of saying ‘I don’t mind being racist’.”

To show the Queensland Senator what he was actually thinking, Briggs created his own billboard to be placed on the back of a One Nation billboard in Frankston, Melbourne.

The billboard depicts the back of Pauline Hanson's head alongside Briggs with his own message, "I'm thinking I can't wait to see the back of Pauline Hanson".

"Anyone going home to Frankston is going to see that grill," Briggs.

The Weekly host Charlie Pickering verified the billboards existence last night, saying "Now it has to be said, we didn't trick that up. We actually bought a billboard."

Earlier this week Briggs told NITV his latest track drew inspiration from Senator Hanson's "It's okay to be white" motion.

“I was like ‘really?’ It’s like this is what you’re wasting time with in the Upper House? It’s like this is what you’re working on? Like it’s okay to be white? Is it okay that we die 10, 15 years before everybody else? Is it okay that the suicide rates are what they are? Is it okay that the incarceration rates are what they are?" he said.