The Collaborative International Dictionary of English v.0.48:

Pursy \Pur"sy\, a. [OF. pourcif, poulsif, poussif, fr. pousser
   to push, thrust, heave, OF. also poulser: cf. F. pousse the
   heaves, asthma. See Push.]
   Fat and short-breathed; fat, short, and thick; swelled with
   pampering; as, pursy insolence. --Shak.
   [1913 Webster]

         Pursy important he sat him down.         --Sir W. Scot.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pursy
    adj 1: breathing laboriously or convulsively [syn: blown,
           pursy, short-winded, winded]