How to reset my iPhone 4s predictive text?

I want to know how to reset my iPhone 4s predictive text words that I've added.

For example, one day I said to my friend, "Me too" and now the word "too" always shows up and it's really annoying. How do I reset that kind of thing?

If you find out, let me know. I'd like to shut down the person that thought predictive text was a good idea. I know at least 500 words that the stupid feature makes me retype a dozen times. I do not watch what pops up as I'm a 10 finger typist.