Are you saying that the horse is overweight, or has just been eating a lot in one go?

I don't think over-eating has a name as such. Colic is a term used to describe any kind of abdominal pain in horses. Horses who eat too much before or after exercise, or eat too much in general, are pretty prone to it. There's different levels of severity in colic, but you should always call a vet when a horse shows the signs of colic in case it is something major, like a possible twisting of the gut. The signs of colic are the horse pacing, looking at or even kicking its sides and belly, lying down and getting up more than usual, sweating and frantic rolling on the ground. You should never let your horse roll when you suspect colic as this could worsen the situation, that could mean fitting the horse with a special anti-rolling rug or leading him around to take his mind off rolling. Unfortunately, colic often comes back, and it can be treated simply but can be a pain for you to keep calling the vet, not to mention the bills and discomfort for the horse.

The best way to avoid colic is to give your horse a balanced feed and enough exercise. If your horse was getting this before, then I think that his little escape shouldn't be a problem Sorry, I don't know if this was exactly what you were asking and I don't have a website which comes to mind but I hope I've helped anyway