A troll beast is the name given to the ex(s) in your life that makes you want to vomit nonstop when thought about. In most cases you were under the influence of SOMETHING the entire relationship. These exes are usually obsessed with you for a good amount of time after you leave them. Nobody should be held accountable for these relationships because they are usually just a practice round for a real relationship. If you've had a troll beast in your past, you are most likely now in a fabulous relationship with you new, handsome/beautiful bf/gf...while the troll beast.... Is not.
Friend: Good God... THAT is your ex??!
You: Yes.. That God awful Troll Beast is my ex. But in my defense, I was drunk the entire relationship.