1). Angry or crazy (especially a Jewish person)
2). Excited or excitable (especially a Jewish person)
3). A Jewish beast
4). A person with last name Berkowitz who exhibits one of the three traits above
1). Levi Goldstein went berserkowitz when he saw his bill
2). Ben Stein isn't berserkowitz
3). Roman Greenberg and Yuri Foreman are berserkowitz boxers.
4). David Berkowitz was a serial killer. He must have been Berserkowitz