What is "flippering"

Usage examples of "flippering".

The one who had been dropped on his head was flippering his hands nervelessly with returning consciousness.

So many fish trying to occupy the same space that they seemed to be flippering on each other’s backs.

So many fish trying to occupy the same space that they seemed to be flippering on each other's backs.

Now there was no point in conserving strength by flippering along with that steady, unhurried stroke.