A term used in online gaming, predominately Call of Duty. Often times when players are killed they are given the option to watch the "kill cam," or skip it and respawn immediately, which is called "rage spawning." It's often accompanied with verbal profanity, or "raging."
Ed: "WHAT?! Random grenades are such bullshit!"
*presses 'X' repeatedely to respawn as fast as possible. (Usually only to be killed again quickly. Thus, rage spawn)*