It was said in the beatles song "Across the Universe". Most simple translation is:
"I give thanks to Guru Dev (heavenly teacher) om"
Om is just a sound. However a more detailed translation is:
"Jai" means "O Hail" or "Victory to" "Guru" means "Teacher" "Deva" means "God/Lord/Demi-God" "om" some say is the source of all existence that comes from vibration
