It comes from a famous saying on the Internet, "She is an electronic butterfly, and when it is turned off, it will leave forever", which means that a person or thing exists for a very short time, and once it is over, it will never come back.

"Electronic butterfly" refers to a virtual existence in the electronic world, which comes from itself, while "off" means ending or disappearing.

So the meaning of this sentence is to remind people to cherish time and opportunity, and not to give up or miss any opportunity easily, because once something is missed, it can never be recovered.