You may have seen codes like these. They're called QR or " quick response" codes and they mean your camera phone can now be a little like a cashier's scanner.
He suggests that scientists, data analysts and policy experts across the world work together as a team to prepare for quick response at the future outbreaks of pandemics in different countries and regions.
Scientists have found that although we are prone to snap overreactions, if we take a moment and think about how we are likely to react, we can reduce or even eliminate the negative effects of our quick, hard-wired responses.
It's not really slang and it's not really rude, but it is a very quick and easy response that you might use with someone you are familiar with, like a friend or a brother or sister.