OG Kush, also known as "Premium OG Kush" or simply "Kush", is one of the most recognizable varieties bred in Florida back in the 90s.

OG Kush is a a consequence of crossing Lemon Thai, Chemdawg and Hindu Kush and a fourth unknown flavor. Describing the scent OG Kush, it's fuel, even skunk, and a bit of spice.

There is an opinion that OG stands for "Original Gangster". And perhaps this is a reference to an even older strain. Or it means the strength of the effect from OG Kush. And the trip from it is really strong, long-term, it is possible to experience a unique euphoria.
So OG Kush is best used in the evening.