"Wesh" is a term that can mean different things depending on the context. As a slang term, "wesh" can be used to say hello or to ask what's up. It can also indicate disbelief or surprise. As a verb, "wesh" can mean to wash or to clean. Some synonyms for "wesh" include "yo," "sup," and "hello" when used as a greeting. As an expression of surprise or disbelief, "no way," "seriously," and "you're kidding" can be used. When used as a verb, synonyms for "wesh" include "clean," "wash," and "scrub." Overall, the use of "wesh" and its synonyms depend on the context and cultural background of the speaker.