This is one rabbit hole that no one should be tempted to venture into. Whether you are Morpheus or Alice, or anyone else, I would advise you to stay away.
I am not sure what this guy is trying to say with this tattoo. Is he saying there is a rabbit in his ass? Is he saying that you should stick something in there? Is he just a fan of the loony toons? Maybe it is none of the above and this is just supposed to provoke questions like these. Either way is is kind of funny.