literal meaning - to kill oneself, commit suicide
urban meaning - like "shoot yourself in the foot" to do or say something that causes problems for you

A person who is always depressed, and also enjoys to eat. When they go home after school or their job, their schedule consists of eating, and then killing self. Also, they always manage to resurrect themselves because they always need to kill themselves

Meaning, take off all your clothes and run around the house naked like your a red head on drugs

A laughable insult that has reached notoriety on some online forums. Often used to mock n00bs.