Webmaster Tools AVG Position

Having trouble understanding a few thing on webtools.

I am getting an average position of 2.0 on a certain keyword. What I understand is that I am 2nd position on average.

What I don’t get is, that this keyword that I am AVG 2.0. Whenever I type it in as a search, I am no where to be seen?

Any thoughts.

Thanx in advance…