Being in service for 8 years, here is where I have heard that. It mainly comes in training where the instructor will ask the group "Are you motivated?"
The class: "motivated motivated hell yeah motivated ooo ahhh I wanna kill somebody ooo ahh I wanna kill eeeeeeverybody"
As always there are a thousand variations to those types of chants
The jodie Iheard on Lackland was about an Airman who went to town, got a girl knocked up and the baby came out saying "Hoo rah I wanna hurt some body. Hoo rah I wanna kill somebody!". My daughter knew parts of it, but not all of it.