Basically I wanted something that wouldn't be taken and was short. The name Puffy comes from a fat bird that used to come to my girlfriends house and stare at her through the window. I felt the bird and I therefore had a lot in common. She called the bird Puffy and would always tell me about what he got up to that day.
I was at her house when I made the account and that was what sprung to mind.. My old screen name was Morton-jn which was a reference to Morton Koopa Jr.