killer-diller
1. Any person or thing that is especially excellent, outstanding, talented, astonishing, etc. Sometimes spelled without the hyphen. She has a reputation as a killer-diller among other lawyers in the state. The music festival promises to be a real killer diller, featuring performances by some of the biggest bands in the world. The new film is being touted as a killer-diller of horror films.
2. Excellent, outstanding, talented, astonishing, etc. Usually used before a noun. He's got a killer-diller outfit picked out for the performance. The band has become an overnight sensation with their new killer-diller song.
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