To schuss means to ski straight down a slope very fast.
Schussing is usually exciting and a little scary, but also a lot of fun.
Examples:
She loves to schuss down the mountain.
He schusses down the hill with a big smile on his face.
They schuss all the way to the bottom of the slope.
The little dog schusses after the ball.
I schuss down the slope like a rocket.
We schuss down the mountain and it feels like flying.