1. A shortened, ungrammatical version of: "I am so violently pissed that I am going to kill you!"
2. A death threat*.
*Person issuing threat is often too angry or furious to use proper grammar. Usually followed by violent act.

Running for exercise and picking up trash you find along the way. It's good for the body, mind, soul, and environment! Started in Sweden but is making its way to the U. S.