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.

Name	Pronounced	Usage
Dinis	dee-NEES (Portuguese), jee-NEES (Brazilian Portuguese)	Portuguese
Katelijn	kah-tə-LIEN	Dutch
Kati	KAH-tee (Finnish)	Finnish, Estonian, Hungarian
Zinoviya	-	Russian
LuboŠ	-	Czech
Kaley	['keili]