"Wass" is a colloquial term that can be used as a synonym for "what's up?" or "how are you?" It is a term that is often used in casual settings, such as with friends or acquaintances. Other synonyms for "wass" include "sup," "hey," "hi," or "hello." These terms are all used to greet someone and initiate a conversation. "Wass" and its synonyms are part of informal language, and it is important to consider one's audience before using them. Appropriateness depends on the context and the relationships between the parties involved.