DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   abs \abs\ ([a^]bz), n. pl. (Anat.)
      The abductor muscles of the stomach; -- a contraction used by
      body-building and health enthusiasts. Used similarly to
      pecs and delts.
      [PJC]