Source : Webster's Revised Unabridged Dictionary (1913)

Puff \Puff\, v. i. [imp. & p. p. {Puffed} (p[u^]ft); p. pr. &
   vb. n. {Puffing}.] [Akin to G. puffen to pop, buffet, puff,
   D. poffen to pop, puffen to blow, Sw. puffa to push, to cuff,
   Dan. puffe to pop, thump. See {Puff}, n.]
   1. To blow in puffs, or with short and sudden whiffs.

   2. To blow, as an expression of scorn; -- with at.

            It is really to defy Heaven to puff at damnation.
                                                  --South.

   3. To breathe quick and hard, or with puffs, as after violent
      exertion.

            The ass comes back again, puffing and blowing, from
            the chase.                            --L' Estrange.

   4. To swell with air; to be dilated or inflated. --Boyle.

   5. To breathe in a swelling, inflated, or pompous manner;
      hence, to assume importance.

            Then came brave Glory puffing by.     --Herbert.

Puffing \Puff"ing\,
   a. & n. from {Puff}, v. i. & t.

   {Puffing adder}. (Zo["o]l.) Same as {Puff adder}
   (b), under {Puff}.

   {Puffing pig} (Zo["o]l.), the common porpoise.

Source : WordNet®

puffing
     adj : breathing heavily [syn: {huffing}, {puffy}]
     n 1: blowing tobacco smoke out into the air; "they smoked up the
          room with their ceaseless puffing"
     2: an act of forcible exhalation [syn: {huffing}, {snorting}]