pickhappy as the day is long . happy as the day is long {adj. phr.} Cheerful and happy. Carl is happy as the day is long because school is over for the summer. Categories: add yours adjective Source: A Dictionary of American Idioms 'happy as the day is long' on video Happy as the Day is Long Fletcher Henderson - Happy As The Day Is Long - N.Y.C. 11.09.1934 Happy As the Day Is Long "Happy as the Day is Long" (1934) Fletcher Henderson sort: relevance, mode: exact match, q: "happy as the day is long", maxResults: 4, videoEmbeddable: true, videoSyndicated: true, safeSearch: strict, type: video Subscribe to: American IdiomsEnglish Slang Add my comment