bully bashing

Bully:

a : a blustering browbeating person; especially : one habitually cruel to others who are weaker

Bashing:
The act of bash or;
1: to strike violently : hit; also : to injure or damage by striking : smash

2: to attack physically or verbally <media bashing> <celebrity bashing>

Bully Bashing: v: When a victim / individual or group of victims / individuals decide to hunt the bully

"Tom was bully bashed today. He deserved it!"
"Lets go bully bashing. I cant wait to see Tom cry."