A: It's a highly theoretical concept of utter nonsense, used to describe the sound of one hand clapping.
Q: Is it a real thing?
A: Not in the least.
Q: Can I buy one?
A: Ha! You think you can just waltz into a quantum market and expect to find a flapdoodle on sale?
Q: What's the point of this page then?
A: To waste your time with absurdities, of course.
You're welcome.
See Also:
A Skeptical Theory of Flapdoodles