Shnaz is a censor word for curseing or swearing that emmits almost the same humor as a curse word, because shnaz is not a word you hear every day.
Jeremy was driving home from a stressful day at work. He had to pick up his eight year old son from baseball practice. Jeremy, who always tries to be a good role model for his son, was already stressed from work. Then BANG!! He has hit a deer on the road. He yelled out SHNAZ! His son laughed, and Jeremy thought "dammm im a good parent"