A person with hair that comes out over there ears like earmuffs, which looks completely ridiculas. added bonuses include if the person loves muffs or pussy.
Woah look at the muff over there, his muffs are so big. Its not that coldoutside, why does he need to keep his ears warm.
Oi the muff! the muff!! oh wait, he cant hear us because he has his muffs on.
An extremely common colloqulism in the UK, meaning to be extactic with ones choices and actions.
Next time you nail that presentation at work or knock a minute off your mile run, tell a friend that you’re “chuffed to the muff,” aka very pleased with yourself.