2.sometimes describes a person that doesn't know how to shut the fuck up.
2. The garrulous fool talked through the entire movie, ruining it for the other partrons!
Most politicans are garrulous - overly talkative about little of importance - talking more about themselves.
Another term for someone who tends to be garrulous - is popinjay. A popinjay is a person who talks way too much in a conceited manner.