cookie wife
A girl that isn't your girlfriend or wife that makes you food. Normally baked goods but meals can count as well.
Jim: "Did Jane make you those brownies because you helped her with that project?"
George: "No she's my cookie wife. I don't even have to put up with her and get free food."
George: "No she's my cookie wife. I don't even have to put up with her and get free food."