iwtl how would (suddenly) consuming >7000 calories per day "shock" my metabolism?

For reference, I am slim and tall (19-20 BMI)

If I were to suddenly eat >7000 calories every day, would the weight gain eventually stop before I reach an overweight BMI?

I ask this because, while eating at a slight caloric surplus (say, a few hundred) would cause gradual weight gain, do you think abruptly switching over to a MASSIVE caloric surplus would cause a "shock" your body's metabolism and cause only a short-term gain in weight, followed by an average-to-slightly above average BMI with a crazy metabolism?