In the 1951 animated short titled Tomorrow We Diet*, the main guy (Goofy) is repeatedly referred to as "Fat". Not "being fat", but literally "Fat":
Where to, Fat?
You're just too fat, Fat!
What'ch you got there, Fat?
Was this a common way to refer to people in the 1950s? As in, literally using what they are as the "name"?
(It's clear that the character's name isn't actually "Fat", because he is seen as having been slim until recently. Also, he gets offended/upset each time.)