Nagasaki racing snake
A Nagasaki racing snake is someone so skinny, they probably don’t have enough meat on them to make a sandwich.
'She’s a Nagasaki racing snake. I bet she could balance on a toothpick.'
'He’s so thin, he looks like a stick that got hit by a truck.'
'That guy’s a Nagasaki racing snake. He could wear a shirt made of spaghetti.'