Legendary Big Bird is a character from the popular children's television show Sesame Street. He is an 8-foot tall, bright yellow bird with an orange beak and legs. The character is known for his catchphrase 'Meep meep!' and his friendly personality. His name is a play on the phrase 'Big Bird' and the word 'LEGENDARY, ' which means something that has been passed down through generations and is widely known. The crossword solution for this term is ROC, which is the acronym for the character's full name, 'The Really Old Crow.'