It should read "tenka muteki" (天下無敵) and it means that no one on the earth can beat me.
It is funny though, because the last character does not look like "敵" as it should.
Instead, it looks like "舌" and "定" come together, like "舌定."
However there is no such character in kanji like this.
Something had to have happened when he or a tattoo artist picked up the design and messed up.
It happens and that is why sometimes pornstar tattoos look so funny.
