1. adjective, childish slang Excellent; awesome; fantastic. Usually hyphenated and used before a noun. Tommy got a super-duper new video game console for Christmas. Jessica is super-duper popular. There's no way she'd go to the school dance with me. Aw, jeez, I'm super-duper sorry about that!

2. adverb, childish slang Extremely; very much; to a great degree. We're all super duper excited to meet your new girlfriend! It was super duper hot in Spain, so we stayed on the beach most of the time.