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 KingArthur wore.
Oh man, when Daylon was passed out drunk, I gave him a KingArthur and took pictures. I left one in his pocket for him to find when he woke up.
A fictional character that some very confused people like to believe is real and get all upset about.
The story of kingarthur was invented by the english while they were busy kicking the crap out of the cultureless welsh.