A two handed, two footed assault, such as what is used by Jason Statham in The Transporter. The Hard 20 is commonly used in a situation when a person is acting up and a simple bitch-slapping will not suffice. (Also known as the Hard 21 in the case of the man with 6 fingers on his right hand in the Princess Bride.)
Keith was acting a fool, so I hit him with the hard 20 and set him straight!
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