The Collaborative International Dictionary of English v.0.48:

Puke \Puke\, v. i. [imp. & p. p. Puked; p. pr. & vb. n.
   Puking.] [Cf. G. spucken to spit, and E. spew.]
   To eject the contests of the stomach; to vomit; to spew.
   [1913 Webster]

         The infant
         Mewling and puking in the nurse's arms.  --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

puking
    n 1: the reflex act of ejecting the contents of the stomach
         through the mouth [syn: vomit, vomiting, emesis,
         regurgitation, disgorgement, puking]