I'd like to know the meaning of 'be out of hit points.'
For example like the picture below.
The phrase hit points is a gaming term, from the realm of role-playing games.
Here's the definition pulled from Google:
(gaming) Health is usually measured in hit points or health points, often shortened as HP. When the HP of a player character reaches zero, the player may lose a life or their character might become incapacitated or die
Someone is using a gaming term in this meme, saying that some of the Pikachus (in this case, the ones that are broken in half, I believe) don't look fully healthy. It's meant to be humorous.
To be "out of" something means to have none of them (or none of it) remaining. If a carpenter is out of nails, he has no nails remaining in his nail pouch. If a supermarket is out of bread, the bread shelf is empty. If a bakery is out of flour, its flour bins are empty.
The nails have been used up. All of the bread has been purchased. All of the flour has been made into bread.