According to news reports, Tesco is issuing employees over retirement age with a phrasebook listing more than 30 of the most common phrases used by teenagers so that older workers to help them understand and communicate with their younger colleagues.
For example, for older workers "getting caned" means receiving six of the best in the headmaster's study and "rank" is one of the few things told to the enemy, along with one's name and number. However, the phrasebook points out that rather than a beating, "caned" means doing something to excess, and "rank" means disgusting or horrible.
Source: The Daily Mail "'That's phat, brotha! Innit?' Tesco issues guide to teenage slang for its older staff" (May 31, 2007)