A slalomer is a person who skis or moves in a way that goes around things quickly.
Being a slalomer is usually a good thing because it means you are good at skiing or moving quickly and carefully.
Examples:
The slalomer went around the flags quickly.
I want to be a slalomer when I grow up.
The slalomer is very fast.
The slalomer can go around the trees without hitting them.
The slalomer can go around the whole mountain in just a few minutes.
The slalomer is the fastest skier on the mountain.