Nerdcore. This is a function for a mathematical singularity. When x=0 this function fails to compute. As x approaches zero from either direction, it aproaches either negative or positive infinity. Cameron had this to say about his tattoo:

I got the tattoo because I like the idea of math not being well behaved. That sound’s lame and I really don’t mean that in some kind of A is for Anarchy type way. I just think that its kind of nice that something as perfectly fuctional as math can kink up around the edges.

I don’t think that sounds lame at all. In fact I think it’s important to remember that even in the seemingly cold world of mathematics there are things that just don’t come to a reasonable answer.