Performed using a sharp, knife-like object which is usually concealed in one's person, it is often used as an informal salutation or greeting toward others whom one is not in good standing with.
"I heard Andrew's gonna give his old mate Stephen a British Handshake next time they meet after that scrap they had at the pub last week"
Upon greeting a lady, a gentleman must place his hand in her cleavage and shake his hand to and fro to shake her breasts. To not do so is a horrible insult.
Did you hear that Mr. Darcy insulted Lady Jane by not greeting her with a BritishHandshake?