The term 'thrilled to pieces' is an expression used to describe someone who is extremely happy and excited. This emotion can be described in many different ways, such as ELATED (6 letters), OVERJOYED (9 letters), on cloud nine (11 letters), tickled pink (11 letters), and in seventh heaven (15 letters). All of these terms are used to express a feeling of great joy and excitement, and they all convey the same sentiment of being thrilled to pieces.