have a hollow leg
To be able to consume a larger amount of food or drink (especially alcohol) than is typical. Also seen as "have hollow legs." The steakhouse, known for its huge portions, is introducing a number of smaller menu items for those who don't have a hollow leg. The way she drinks on a night out, you'd swear she has a hollow leg.
to have a hollow leg
Fig. to have a great capacity or need for food or drink. Bobby can drink more beer than I can afford. I think he has a hollow leg!