There are many synonyms for "wast in fat city," which means to be living a life of luxury and excess. Some possible alternatives include living the high life, being on Easy Street, or enjoying the lap of luxury. Other similar phrases include living in the lap of luxury, living like royalty, or having the world at your feet. Each of these expressions evokes a sense of wealth, privilege, and abundance, suggesting that the person in question has few worries or cares. Whether one is using "wast in fat city" or one of its synonyms, the sentiment is clear: to be living the good life.