mdzz

This is an abbreviation of a Chinese word, "Ma De Zhi Zhang", or pronounced as "Mad The Zee Zhang". People use the word to express their anger or despise. Can be used in any conversations.

Tom: "I just bought a new bike! "
Amy: "mdzz"

Tom: "Hey girl, do you want to hang out with me? "
Amy: "mdzz" (and leaves)