If you suck really hard, you can suck at your teeth down as far as the roots. So I presume "That s-s-sucks the r-r-root" means "that really sucks".
Did you ever wonder why? Well look at the intricate root patterns below the tree. Water is in the ground, so to extract water to keep the tree alive, the roots suck!.
I saw the Roots at a josediaz.info maybe 5 or 6 years ago. the defacto white hipster go to band for seeming "cultured" but they suck ass.
that was my first and only experience with said roots. i'm all for listening to various bands and genres, but this 'music' is so the antithesis of everything i have.