The term 'Whaddya Know?' is an informal expression used to express surprise or amazement. The crossword solutions for this term are GEE (3 letters) and WELL (4 letters). GEE is an interjection used to express surprise, while WELL is an adverb used to express a range of emotions, including surprise. Together, these two words form the phrase 'Whaddya Know?', which is often used to express surprise or amazement.