basically, he's a wise man, a seer, a sage, maybe a prophet. He has great knowledge and great wisdom, much of it attained through experience. He may have a connection with God.
A classicAustralian colloquialism used primarily by Australia's older order, namely Jeff. When uttered, this word strikes fear in the hearts of young beta males who fail to understand simple concepts.
Jeff: What did you get for the answer for 1-e^-t/rc?
Student: haha 69
Jeff: Holy White Man!