retard:
a person who is stupid, obtuse, or ineffective in some way: a hopeless social retard.
Automotive, Machinery. an adjustment made in the setting of the distributor of an internal-combustion engine so that the spark for ignition in each cylinder is generated later in the cycle.
Oh and by the way,
I think the Demon Sheep ad is retarded...and hilariously funny in a bizarre what were they thinking way..with a anyone who thought this was a good idea should be run out on a rail.