Definition of muffs:
(n) :
(vulgar slang) The vulva or vagina; pubic hair around it.
(n) :
(synecdochically, vulgar slang) A woman or girl.
(n) :
(slang, chiefly sports) An error, a mistake; a failure to hold a ball when once in the hands.
(v) :
(sports) To drop or mishandle (the ball, a catch etc.); to play badly.
(v) :
To mishandle; to bungle.
(n) :
(colloquial) A fool, a stupid or poor-spirited person.