Humee Hum Too Hee Too
Humee Hum Too(n) Hee Too(n) Wahe Guru
I am Thine in Mine Myself, Waheguru.
Also sometimes:
Humee Hum Tummee Tum Waheguru
Language: Gurmukhi
Translation:
I am Thine, in Mine Myself.
Wahe Guru: Ecstacy of Inner Wisdom.
This mantra information is from Spirit Voyage