1. Sombody (preferably a girl) who has a muffin top/lovehandles or is a fatty.
2. A person who doesn't know how to tease their hair and it looks like there is a muffin on their head.
3. A type of tasty pastry.
-Oh gosh,look out man! Here comes a Muffin!
-Look at her head,she's a muffin.
-Guess what i had for breakfast? A Muffin!
-Ewwwwhhhhhh! I cant believe i have to look at that person, they're such a muffin!