A person so stupid you feel the need to spank their dumb ass into cognitive awareness. see slaptard
I've seen cups of coffee with more intelligence than you spanktard!
It is the feeling of pure retardation after a long series of BDSM Spanking. You are unable to speak, communicate or operate your body. You are in a euphoria state or subspace from spanking.
"Oh man, those spank marks look rough, you okay?"
"ya, i was completely spanktarded after them"