Bigosh is a term often used to express surprise or emphasis, similar to saying "goodness" or "wow." It is an exclamation that can convey a range of emotions, from astonishment to excitement. The word is informal and is typically used in casual conversations. The origin of "bigosh" is believed to be a variation of the phrase "by gosh," which has been used in English for many years. It is not commonly found in formal writing but is popular in spoken language, especially in certain regional dialects.