Petered is a stage of next level pissery in which a person is so drunk that the pupils dilate to extremes, the user cannot speak and only has use of his most basic functions.
Soaking a tampon in vodka or other hard alcohol and inserting into your pussy in order to get plastered, aka drunk. Perfect for high school dances or when being breathalyzed.
When someone exceeds one's own toxicity level on st. patty's day, during the "plastered mcshitfaced" stage it's rumored that one sees leprechauns and a pot of gold as well as a speaking with an Irish brogue.