An Aboriginal activist who called for Australia to be 'burnt to the ground' has denied her new tattoo is a nod to a crude anti-police slogan.

'Invasion Day' protest organiser Tarneen Onus-Williams posted a photo to her Instagram account on Monday showing off an 'ACAB' tattoo on the back of her thigh.

The letters are often used as an acronym for 'all cops are b******s'.

When approached for comment on Tuesday, Ms Onus-Williams said the letters stood for 'all cats are beautiful'.

However she said she understands that the tattoo could be 'easily mistaken'.

'Even if it was about the cops, the cops have never been held to account for 300 plus black deaths in custody in Australia. No police officer or prison guards have been convicted for their deaths,' she told Daily Mail Australia.

While denying her new tattoo was an anti-police slogan, she said her Aboriginal community had long suffered at the hands of law enforcement.

'There has been no justice for deaths of Aboriginal people at the hands of violent police and prison guards,' she said.

'My community still lives in terror from police violence and the prisons.

'I'm a huge cat fan, but also understand it's easily mistaken.'

When Ms Onus-Williams posted a photo the tattoo on Instagram this week, it prompted a slew of supportive comments from her followers including 'f*** yes' and 'too right'.

The 24-year-old activist, who has worked for several state-funded programs, has previously courted controversy for yelling offensive slogans at Australia Day protests.

Ms Onus-Williams led a crowd of thousands in Melbourne in January where she shouted 'we have not organised this to change the date, we have organised this to abolish Australia Day because f*** Australia, f*** Australia, I hope it f***ing burns to the ground'.

The Aboriginal activist refused to apologise for the comment which she claimed was a metaphor and 'not actually a statement to be taken literally'.

Ms Onus-Williams, who has served on the Koorie Youth Council and Aboriginal Interim Treaty Working Group, has previously been questioned for her apparent disrespect for the Australian government and its police force.

Former Australian Labor Party president Warren Mundine, who is an Aboriginal leader, called Ms Onus-Williams a hypocrite for attacking the government while working for several state-funded programs.

'The serious question here is why is the government funding these groups and these organisations when the people involved are haters who have no scruples about taking taxpayers' money and then spitting in their faces,' Mr Mundine told The Australian.

'And governments only have themselves to blame for wasting taxpayers' money, because there's no real rigour in appointments and no questions about where this money is going. And then you see money going into causes and demonstrations where people are racially abusing and threatening people it has to change.'

Former Victorian premier Jeff Kennett told The Australian the 24-year-old should step down from her role with Koorie after her comments.

The Koorie Youth Council previously told the publication it didn't support Ms Onus-Williams' comments, who the organisation said had been a volunteer since November 2016.

The Koorie Youth Council did not immediately respond to a request for comment on Tuesday, but Ms Onus-Williams said she no longer worked on the board.

The Victorian Government told Daily Mail Australia Ms Onus-Williams was no longer serving on the government funded Aboriginal Interim Treaty Working Group.

Ms Onus-Williams has previously posed with Married at First Sight star Telverne (Telv) Williams, calling him her brother.

The 24-year-old spoke about Telverne in a post on her blog 'Dat Blak One'.

In the post, Ms Onus-Williams said he helped raise her, and taught her how to 'throw her middle finger up' from a young age.