Spieing means talking a lot, especially in a way that tries to persuade or sell something.
Spieing can feel pushy or annoying if someone doesn't want to listen.
Examples:
He's always spiels about his new car.
She's spiels about her favorite book.
They are spiels about the benefits of exercise.
The salesman spiels about the amazing features of the vacuum cleaner.
The politician spiels about making the city better.
Stop spielling about your toys!