Well, tattoos are certainly a popular subject online. I guess with Tatood.com you are going for a misspelling of tattooed. I see where you are coming from, but I'm not sure whether someone wishing to start a tattoo site will accept this misspelling. Good luck anyway.
I think "cool" misspellings can work, I guess offering it to the market will tell you if someone likes it. It was the single t I wasn't sure about, when it should be tt. Good luck with it.