Cracked up' is an idiom that means to become overwhelmed with emotion, usually laughter. The crossword solutions for this term are WRECKED (7 letters), LAUGHED (7 letters), GIGGLED (7 letters), and WENTMAD (7 letters). WRECKED implies destruction or chaos, laughed suggests uncontrollable laughter, GIGGLED implies a lighthearted chuckle, and wentmad implies a state of insanity. All of these words describe the feeling of being 'cracked up'.