You are "bottom" feeding. And you are correct about top feeding. I am a bottom feeder, also known as a Carp!! Catfish would fit also. And don't let anyone tell you you are a bad person if you bottom feed, I am a good person who happens to bottom feed..... Either way gets the wood cut.
Some saws you can only bottom feed on, like the Hegner, the older Hawks, some you can do either, like the Excalibur, Seyco, King and DeWalt.