om ah hung benza guru pema siddhi hung
“Homage to the diamond master, born in the lotus.”
“Homage to the enlightened powers of the Lotus-born Guru.”
Om ah hung is an invocation- just syllables to start a prayer.
Benza (or vajra) is diamond or thunderbolt
Guru is master
Pema (or Padmé) is lotus.
It’s a way of affirming that the lotus grows and flourishes out of the mud of one’s own nature. Those enlightened powers grow in the mud of our own base nature.