Stump break is the same as stump bust except it is commonly done on the farm and to farm animals when they're still young. It's the act of tying a horse, cow, or other farm animal to a tree or stump so they cannot get away and mounting them sexually.

When an individual living the state of Texas, stand upright on a tree stump so as to position his groinal area close to and engage in a sexual manifestation of penile nastiness with a COW.

It is when you tie a goat to a stump and fuck it to death.