An Australian woman has admitted she had her Italian roommate deported after they set up a tattoo parlour in the living room and failed to pay four weeks' worth of rent. 

'Sarah' made the confession on Sydney radio station 2Day FM's breakfast show on Wednesday. 

'I should preface [that] this was a really annoying roommate... I don't know if I can fully justify it, but I'll try,' she told presenters Nath Roye and Emma Chow.

'She used to tattoo people in our living room. [It was] a business, without consulting [us].

'She did also just skip out on the last four weeks of rent and [went] on a holiday.'

Sarah said she reported her roommate, informing authorities that she may have breached the conditions of her relationship visa.

'I knew she was here on a visa in a relationship with her partner,' she said.

'She had falsely declared that she was living with him, but I had banking records that she paid me every week for rent.

'I googled it. There's a government department where, if someone is fraudulently in the country, you can actually provide them evidence and they'll go and investigate.'

Chow asked if Sarah had written into Google: 'How do I get someone deported?'

'Pretty much,' Sarah replied.

'It took a little while. We weren't living together at that point because she skipped rent and left,' she added.

'But, at that point in time, we were Facebook frenemies. So, I got to see the whole thing play out slowly. 

'I don't think she ever quite figured out it was me. 

'But they would have said false declaration, so she must have been sitting there like, "How did they know that I don't live with my boyfriend?"'

Asked whether she had been fully deported and could not return, Sarah replied: 'No. Gone.' 

Roye and Chow welcomed Sarah to 'The Revengers', where listeners describe acts of retribution on air.

They told her to 'grab yourself a cape, you're saving the world one plot of revenge at a time'.