What is a hypercaloric diet?
A hypercaloric diet is the opposite of a low-calorie diet, meaning you'll consume more calories than your body uses.
If your body burns 2500Kcal daily and consumes 3000Kcal, you are following a hypercaloric approach.
The same example of low-calorie feeding can be applied here, individual A spends 2000Kcal per day and individual B spends 3000Kcal per day on a 2500Kcal diet, individual A will be following a hypercaloric regimen and individual B spends a hypocaloric regimen.
Hypercaloric diets are used to gain muscle mass/weight.