What is a quantum vacuum fluctuation?

[Our Lord Sasuke]

I heard many times about Quantum Fluctuation, but I don't understand it very well.. it's based on Heisenberg Uncertainty?
Can you help me guys?

 

[BlacLord™]

A change in the amount of energy that exists in a single part of space.

 

[Marin]

It's a sea of fluctuating energy as far as I get it.

 

[King Richard]

A fart in space