Puffda is how cool a person is within their circle of friends. Typically a puffda is not the most popular but just one of them guys in the middle who everyone gets along with. A person who no-one hates.
Puffda is used within the UK a lot from a young age up until 15 where then it is phased out.
A: Wassup puffda! How you been?
B: Not bad not bad