(to go) chimp on - verb - to be filled with irrational rage/fear and hit, crush, push, beat, shoot someone for no reasonAs in, "No one knows what happened. Chris Brown just went chimp on Rhianna.
Or, as in, "Black men have to be careful around cops of any race. They're all likely to go chimp on him like they did Sean Bell."
But for now, I'm just going to make use of the oldie but goodie, "postal." This, my dear friends, is for the New York Post, even if you've seen it already.