Om Namo Bhagavate VASUDEVAYA (Sanskrit): is one of Krishna’s evocation of mantras. OM is the interdimensional vibration that permeates everything and everyone.
Namo: Salute or reverence to the divine power.
Bhagavate: Respect the Lord.
VASUDEVAYA: Vasudeva is the carnal family that created Krishna. The Ya added at the end means the active feature (male) of the mantra. When someone does this complete mantra evokes Krishna as a man who also lived on earth and know the difficulties faced by all.