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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. an excellent thing or person. She is just a real killer-diller.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.