I aspire to be rational and pragmatic in politics, as TrPrado describes, but the thing there is that you can't judge the value of something if you don't know what your goal is. By TrPrado's definition, I would call myself centrist, but the goals I wish to achieve center around helping people. As such, I decide rationally, without caring whether a policy is left or right, what option helps people most in the end.
In practice, that means I'm more likely to support left plans concerning social support etc.
I would never turn down a policy on the basis of it being right, though. I judge it on its own values.
As such, I'd be mostly left (by European standards, so perhaps a radical communist by American standards), but I'd get there by judging the individual value of a policy based on what policy furthers the goals I consider important most.
As such, if I have to pick between left and right with no other options I say left for sure, but I still prefer to call myself a centrist as well, which I think is indeed a useless term if I get to call myself that.
Can I just call myself a left-leaning pragmatist? :-)