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}.] [1913 Webster]