He is #daddy. Arthur is a hot, brave, sexy beast. He is also a clotpole, dollophead, prat, royal ass, ignorant, and loves to take his shirt off. He thinks his servant Merlin is a complete idiot, but also loves him.
To slap/push/ram/force/bump another person from relative safety into a dangerous situation where they are likely to be injured (or even KILLED) whilst recovering from the afore mentioned slap.
On the PS3 game Little Big Planet, you can effectively slap or arthur park someone towards danger repeatedly until the 'sack person' is killed. Is most effective on a survival level. It can also be used to describe pushing someone into a road, although this is neither recommended or supported.