The term 'IMAGINE THAT!' can be broken down into six crossword solutions: IDEA (4 letters), WHADDAYNOW (10 letters), GEE (3 letters), ILLBE (5 letters), GEEWHIZ (7 letters), and THEIDEA (7 letters). This phrase is often used to express surprise or disbelief, and is usually accompanied by a gesture such as raising one's hands in the air. It is also sometimes used to express enthusiasm or excitement.