skull-buster

skull-buster

and skull-popper
1. n. a difficult course in school or college. The course was a skull-buster, and I had to drop it.
2. n. a police officer. (Refers to the striking of skulls.) Two skull-poppers came up and started asking questions.
References in periodicals archive ?
The knife's corpulent, yet comfortable handle features a deep finger choil, hearty textured G10 scales, and a skull-buster base with lanyard hole.