The Brief: Smol is a popular online variation of the word "small."
Smol usually describes something that is both small and cute. It can refer to people, animals, or anything else. The phrase “smol bean” is a way to describe a tiny and cute being. “Smol” is usually pronounced somewhere between “small” and “smole” or like “small” with an English accent.
— Cats 🐈 (@bestcataccount) March 11, 2019