"I deserve it, I have been made redundant twice over the past year," she said in the listing.
The auction, which runs until Friday, January 20, has already received more than 30,000 views.
The latest bid was $2029, far from bottom dollar but still below the reserve.
The listing had received only one complaint and most people were taking it in good humour, Trade Me spokesman Paul Ford said.
Tina, 23, told APNZ she decided on the stunt because she was in debt, planning on travelling to Australia in March and it was for a good cause.
She could not believe the publicity generated since she posted the auction yesterday and then put it on her Facebook page.
"It's crazy, I honestly believe this was all through Facebook."
It was not the first time she decided to have a crack at selling a piece of her skin.
"I had actually listed this on Trade Me two years ago but they took it down straight away."
She thought her auction would meet reserve and said she would get the tattoo the day after it closed.
"I guess the publicity around it is on my side. I'm not nervous about the tattoo at all, it's my last worry. To be honest I'm more nervous about what's happened, how its all escalated."
The auction has been the butt of some good-natured jibes, with many Trade Me members making cheeky cracks about what the tattoo could say.
"How about 'I am a loser' LOL", Radioactive suggested.
A woman said she would bid if she could put "no entry" on the vendor's bottom.
And another user added: "It would be worth bidding just to get 'Holdens rule, Fords Drool!' lol or maybe a grassy meadow."
Tina, who already has other tattoos, said she would get the latest addition done at a place of her choice.
A framed photo of the completed design would be sent to the winner, who could watch it being done if they lived nearby.
