It means she doesn't want other women stealing you, but she loves you enough that a little pudge won't bother her. She's claiming you.
Now you just have to figure out ... why?
Could be she's planning on feeding you to some sacrificial demon beast.
she's inviting her whole family to the roast.
@om nom nom: They call those "weddings".
So? Eat/Drink up my friend. When you get to the size of Michael Moore, we shall worry.
THERE IS NOTHING WRONG WITH THIS. We have a word for girlfriends who do this: "keeper".
@Combusti: I wholeheartedly agree. Strangerbox has been fattening me up for a year now.