to cover with slobber or saliva; to drool all over something.
From be- (prefix) + slobber (from Middle Dutch slobberen, to eat sloppily). The intensive prefix emphasizes the messy, excessive nature of the slobbering.
Slobber, slaver, and slabber are basically synonyms from different language families—Dutch gave us slobber, Norse gave us slaver—and English loves borrowing multiple words for the same gross thing!
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