Also stated as "Hows That?" when the fielding side is appealing fro a dismissal. The Australians first used it.

interj. cry used by the fielding team to make an appeal to the umpire, requesting a decision on whether a batsman is out, abbreviated from the query "How is that?"

In South African English, howzat is often used as a form of greeting. The term is an abbreviated form of 'how is it going ?' and the appropriate response is sharp, often doubled and spoken with the r silent.