A supersalesman is a person who is very good at selling things.
A supersalesman is someone who can make people buy things they might not need.
Examples:
The supersalesman sold a lot of cars.
I want to be a supersalesman when I grow up.
The supersalesman convinced everyone to buy the new product.
The supersalesman could sell ice to a polar bear!
The supersalesman could sell a million umbrellas in the desert.
The supersalesman is the best at selling things.