hey there, "kush" comes from the himalayan mtn range Hindu Kush. The strain of cannabis was originally from the areas of afghanistan, pakistan, and india that the Hindu Kush range is around. The different strains of Kush are the bomb, from OG to Bubba to Purple Kush. Now it is becoming a fad name for good bud, like fire or whatever. but it is an awesome strain if u get the legit stuff. My personal favorite.