full retard

Etymology 1
From the 2008 film , in which "going full retard" is used to describe an actor growing to identify too much with the mentally subnormal character he played.

Noun

 * 1)  A state of engaging in extreme levels of stupidity.

Usage notes

 * Mostly expressed as to go full retard.

Noun

 * 1)  The setting on a magneto when the ignition spark occurs as late as possible, just before the piston reaches top dead center.