have hollow legs

To be able to consume a larger amount of food or drink (especially alcohol) than is typical. Also seen as "have a hollow leg." The steakhouse, known for its huge portions, is introducing a number of smaller menu items for those who don't have hollow legs. The way she drinks on a night out, you'd swear she has hollow legs. Lou must have hollow legs because I know how much he's had to drink tonight, and I would be absolutely bombed by now.