Gadol

Gadol or godol (גדול‎, plural: gedolim גדולים‎) (literally "big" or "great" in Hebrew) is used by religious Jews to refer to the most revered rabbis of the generation.

A similar title is Rashkebahag, which is an acronym for "Rabbon shel kol bnei hagolah" (The sage and teacher of the entire Jewish diaspora).

A gadol is quite often also a posek (a decisor of Halakha - Jewish law) and may be the author of rabbinic literature and responsa.

[2]In Hebrew halachic texts, gadol is also used as a term for a Jewish boy who turns thirteen, and is viewed as an adult regarding to his obligation to practice the 613 commandments.

In modern Hebrew, gadol as slang is used as an interjection to mean something is extremely cool, out of this world, superb, awesome, absurdly funny or hilarious.