refers to hare krishna maha-mantra. Came into popularity during the age of Lord Caitanya in the late 16th through early 17th century. chanting of this mantra is said to elevate one to God consciousness (Krishna consciousness)
"Hare Krishna Hare Krishna Krishna Krishna Hare Hare, Hare Rama Hare Rama Rama Rama Hare Hare."
by bhagavad-gita March 07, 2005