As I understands it spin is a way of defining quantum states of a particle.
Yes, but it was called "spin" because the particle was behaving as if it was spinning about an internal axis.
If Moogly means ordinary spinning objects like soccer balls, that has to do with spin and forward motion generating an aerodynamic force on the ball so that it curves clockwise as well. Since angular momentum is conserved, that means that the ball will lose spin to curving.
Spin in some fashion is used in many ball-based sports: baseball, tennis, ping pong. Even the sport that doesn't use a ball at all - American Football, rotates the prolate spheroid about its axis to stabilize it in flight.
Note that since it's an aerodynamic effect, curving would not work in a vacuum. But using spin to affect how a ball bounces would as that is interaction with the playing surface.