There's two ways to define "Slobbernut"
The first is a normal insult, as a way to call someone messy or, tends too drool
more than they should.
The
second term is a saying is for the
wrestling in bed, it's a sloppy blow, or a slippery suck, a very wet blowjob.
Person one - Bro clean up your room you slobbernut
Person two -
I'm sorry but I can't help drooling all over my stuff
Person one - hey did you see how wet Johns pant's were
yesterday
Person two - yeah
that chick gave a real slobbernut