Best when used when approaching a closed door with a person of diminished mental capacity and they don't know what to do, you should say.. "Knock Retard!"
In this case, it means:
Knock Retard (hereafter referred to as KR) is the response from the PCM to cylinder detonation. KR is the measure of the number of degrees of overall ignition timing advance that must be removed from the engine to prevent detonation from continuing, thus protecting the engine from damage.
