When a
guy lays his cock and balls out on someone's face.
The
balls need to be over the victim's eyes, and the dick needs to be laying over the nose and the mouth (if you can reach that far.)
The name comes from the fact that this
will look like the victim is wearing a medieval mask/helmet, like King Arthur wore.
Oh man, when Daylon was passed out
drunk, I gave him a
King Arthur and took pictures. I left
one in his pocket for him to find when he woke up.