1. Weed philosophy and theory.
2. Bong Physics.
3. Agriculture and Cultivation.
This is a fake degree eluding to the fact that you know your cannibus very very well.
Dude2: "Do I smoke up? Hah, I got my post-doctorate doctorate in weed science. I'm majoring in Astro-Bong Physics and they are sending me to the moon to see how a bong works in space."