A god of a goddess could be interpreted several ways,
I would go with "feminine god" because I think it's funny,
but other interpretations of your phrase could be;
The husband god to his wife(a goddess),
The ruler of a particular goddess,
a very powerful and possibly masculine goddess,
or a typo.
Gods and Goddesses (male and female)
they are the higher being when you want to invoke them to do higher magick or ask them for help with your work..
But you dont just call upon them with silly things, like can you change my eye colour or make me lose weight etc!