The Collaborative International Dictionary of English v.0.48:

Slaver \Slav"er\, v. i. [imp. & p. p. Slavered; p. pr. & vb.
   n. Slavering.] [Cf. Icel. slafra. See Slabber.]
   1. To suffer spittle, etc., to run from the mouth.
      [1913 Webster]

   2. To be besmeared with saliva. --Shak.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Slavering \Slav"er*ing\, a.
   Drooling; defiling with saliva. -- Slav"er*ing*ly, adv.
   [1913 Webster]