Yes, it means to cartwheel. To flip end over end is sometimes used to describe car crashes. For example, "In the offroad race, there was an awesome crash where the car flipped end over end." This would mean the car became seriously airborne, which is why it was able to flip over like this. A slinky flipping down stairs is a good visualization of what you're asking about.

Yes, the verb "cartwheel" captures this meaning exactly.