Do you already have tattoos? I suppose it depends on the size and location and what your overall aesthetic is.
My personal advice would be to make it yours somehow rather than doing just the plain logo. It'll be there forever and even if the site is memorable to you, it's still just a logo that someone else designed and your feelings may change over the years. You could work with a tattoo artist to create a unique design that represents how the site affected your life and still incorporates the logo somewhere.
...Unless of course you're being serious, in which case get it huge on your chest with "in autism we trust" arched above it in script font