Other forms: slobbering
To slobber is to let saliva drip from the mouth. The dog slobbered, slobber on the cushion, a slobbering mouth.
It belongs to dogs and to babies, and used of an adult it is unkind. Some breeds slobber because of the shape of the lips rather than from any excitement — a mastiff or a bulldog simply cannot hold it all in.
1verbslobberTo let saliva drip from the mouth.
“The dog slobbered all over my trousers when I gave him a biscuit.”
slobber is a dribbling.
Middle English sloberen, from Middle Dutch slobberen, to feed noisily or slurp.
Middle Dutch
slobberen
Middle English
sloberen
English, today
slobber
From Middle English sloberen, borrowed from Middle Dutch slobberen (> Modern Dutch slobberen (“to slobber”)), related to West Frisian slobberje (“to slurp”), German Low German slubbern (“to slobber”). a doublet of slabber and slaver. Compare also German schlabbern (“to slobber”). At least in the sense of "saliva", apparently not related to English slob, from slaba (“mud”).
Etymology from Wiktionary, CC BY-SA