Maathanga is a prayer and a salutation to Lord Ganesha (who is called Ganapati in the South of India) and the lyrics are all in praise of different aspects of his character and attributes and his family connections! Lord Ganesha is praised as the remover of illusions (Maya), the son of Lord Siva (Shambo) and Goddress Parvati (Mata Maheswari) with an elephant face (Mathanga) riding on a mouse (Mooshika Vahana) 

Mathanga Vadana Andanda Sadana Mahadeva Siva Shambo Nandana

Oh Son of Lord Shiva (Nandana), the Lord with the Elephant's face, beaming down on us with bliss (Ananda Sadana)

Maya Vinashaka, Mooshika Vahana Mata Maheswari Bhavani Nandan 

Oh Son (Nandana) of the great universal mother (Mata Maheswari), the destroyer of illusions (Maya Vinashaka), and who has a mouse for a vehicle (Mooshika Vahana) Maha Ganapati Mangala Charana

Oh Great Lord (Ganapati), I bow down at your auspicious feet