Thor cracked a grin. He had finally caught on to some of the lingo of modern Midgard thanks to Katherine and her friends, and the islanders who were far more up to speed than his Asgardian verse. So, he answered Arthur's first question, "It means you are incredibly bizarre, likely not all right in the head. Probably from repeated bludgeoning."
He looked at Katherine for confirmation as he then turned his gaze back on Arthur. The king.
"My niece is no liar," Thor told the younger man with obvious insult in his tone. "She says what she means. You would do well to remember that."