To injure your balls through playing a game. Normaly results in mass pain, side effect of rolling around on the floor in the future, while the memmory of the event is triggerd. Can be triggerd by someone talking about it, or seeing someone suffer a simalar injury.
They were playing nutball, during this game he was greged.
When you get so drunk you endanger your life by falling head first into things such as open parking garages etc. Then embarrass yourself by vomiting in the home of the one who is taking care of you. Then end up in a hospital.
"Lets get Greged tonight dude"
"Dude you were so Greged last night"