Source : Webster's Revised Unabridged Dictionary (1913)

Slabber \Slab"ber\, v. i. [imp. & p. p. {Slabbered}; p. pr. &
   vb. n. {Slabbering}.] [OE. slaberen; akin to LG. & D.
   slabbern, G. schlabbern, LG. & D. slabben, G. schlabben,
   Icel. slafra. Cf. {Slaver}, {Slobber}, {Slubber}.]
   To let saliva or some liquid fall from the mouth carelessly,
   like a child or an idiot; to drivel; to drool. [Written also
   {slaver}, and {slobber}.]