Used by girls who wear PVC clothing,
failed english at school and think deely-boppers are funny.
People that pronounce the word like this usually have a strong irritating accent, hence why they lack the capability of saying the damn word properly.
Pearl:"I'm gonna do nuffink"
Cassandra:"Pearl, did you steal the contents of my stationary drawer?"
Pearl:"Naw! I didn't do nuffink!"