It’s rude to call anyone a fatty, unless you are talking about the fatty Indian Head Penny (IHP).
The fatty Indian Head Penny refers to pennies minted from 1854-1864 when the pennies had a bigger diameter and were thicker. The 1856-1858 Flying Eagle Cents are also “Fatty” pennies.
- Fatty Cent Weight: ~4.67 grams
- Regular Cent Weight: ~3.11 grams
I don’t own a fatty Indian Head Penny, but I do have an 1857 Flying Eagle Cent we can use for comparison.

From above it is hard to see a difference between the size two coins. The 1857 Flying Eagle Cent has the same diameter as the 1888 Indian Head Penny.
When we look from the side, however, we can really see where “fatty” cents got their name:

The Fatty Flying Eagle Cent is about 75% thicker than the regular cent. If these coins were being renamed today we would call fatty cents “chonky cents” instead.
Here is the reverse of these two coins:

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