Self-Gun 

The act of pointing a firearm at your own head and pulling the trigger.

Life sucks, I wanna commit self-gun

Self-Gun by Suldebaker April 2, 2020

Self-Inflicted Gunshot Wound to the Head 

How many people end their lives. Used mainly by people who have listened to too much emo. Can also be used by people who have had to endure many long hours of Mr. James Hartman's class, or sit through Ms. Rheude's band.

Goddamn! I'm so sick of this shit! I think it's time for me to kill myself. I shall utilize a Colt .45 Automatic pistol, and this should effectively create what the medical examiner would refer to as a self-inflicted gunshot wound to the head.

Self-Inflicted Gunshot Wound to the Head by The retarded fucking dog. May 2, 2005