Huffed means to speak or breathe in an loud, angry manner, usually to express annoyance or irritation..
Have you heard of the nursery rhyme, 'The Three Little Pigs'? In it there is a big, bad wolf who tries to eat the pigs, they each build a house, one of straw, one of sticks and one of bricks. The wolf goes to each of their houses and says, 'Let me in. Let me in little pig or I'll huff and I'll puff and I'll blow your house in!'. The wolf manages to blow the straw and stick house down, but fails to blow over the brick house. A bit off topic - but a good way to show what huff in context!
Huff can also be used to describe being angry or annoyed, as in 'he walked off in a huff'.