There are several synonyms for the phrase "so what" that are commonly used in English. These include phrases like "what's the point," "who cares," "big deal," and "why bother." Each of these phrases has a similar meaning to "so what" in that they are dismissive and imply a lack of interest or concern about something. These phrases are often used to express indifference or to downplay the importance of something. While they can be quite casual and even rude in certain contexts, they are also a common part of colloquial English and are often used in everyday conversation.