Malaysian Chinese is a Malaysian of Chinese origin. Just as simple as that.
*p/s: I read the other definition for Malaysian Chinese, and it's sad to see all these nonsense, signs of failed civilization. But don't worry, it's just minority. I believe on some parts of Malaysia, the 3 main races are good friends, and the number is growing =)
Malaysian Chinese in Lang Valley invented a local dish called Loh Mee, noodle in thick gravy, meats and prawns, sometimes paired with curry for extra spice!