From the recording Ann Arbor Holiday Kirtan 2010
Om is the universal mantra invoking the possibility of achieving enlightenment. Mata means mother. Mata Kali and Mata Durga are two aspects of the divine feminine, one in her fierce-est form and one in her warrior persona. The words in this chant invoke the support of more vigorous energies of feminine consciousness to achieve enlightenment.
Om Mata Kali Om Mata Durga
Kali Durga Ye Namoh Namah