From Halopedia, the Halo wiki
Grievish, from what modern etymologists know, resulted from a particularly mind-bogglingly stupid typo by Grievous797 during a caffeine haze. While typing "Hello thar" to the #Halopedia IRC channel, he was accidentally a key over. Instead of typing "Hello thar", he typed "Pjao tjar". The word stuck as a formal greeting to those associated with Grievous, and modern day Grievish was born.
- Ro'alwhoufh - Good night.
- Pjao Tjar - In the Halopedian High Speech*, means "Hello Thar", while in modern English it simply means "Hello There".
- Rb'mih - Evening.
*1337 Sp33k, for the degenerates