chatterbox
Such a person is called a chatterbox.
tattler.
Gothic
By listening to how much talking they do.
A chatterbox LOL
a teller
Someone who talks a lot and doesn't know how to be quiet .
loquacious
It means someone talks a lot.
Depends whether you want a clout round the ear.
I would rather say that if the person talks about how intelligent they are then i for an adult call it conceded.
cheater. when someone talks about hacks or glitches, that is like cheat