hollow leg

noun2

1. •
   Capacity to eat large quantities.

   • When I was young and growing a lot, and Mama couldn't feed me enough, she used to say I had a hollow leg. — 1998
2. •
   Ability or tendency to drink large quantities of alcohol.

   • I didn't want his unhappiness or his pain, or his personality changes, but I wanted to drink as much, as often. I certainly wanted his hollow leg. — 1985