In no way can I catch the meaning of 'My mama done told me'... )
It's from Katie Melua's cover of the song 'Blues in the night':
My mamma done told me,
when I was in pigtails,
My mamma done told me, Hon,
A man is a two-face
he'll give you the big eye,
And when the sweet talking's done.
A man is a two-face,
A worrisome thing who'll leave you to sing,
The blues in the night
Please, give me a hand.