like to hear (oneself) talk
To be self-absorbed and self-important in one's speech, without having much or any regard for those to whom one is talking. I learned pretty quickly that the boss just likes to hear herself talk, and she'll find any excuse to give you a long-winded lecture about something you already know. Political blowhards like these just like to hear themselves talk—they couldn't give a fig for the people who actually have to live with these policies.
like to hear oneself talk
[for someone] to enjoy one's own talking more than people enjoy listening to it. I guess I don't really have anything to say. I just like to hear myself talk, I guess. There he goes again. He just likes to hear himself talk.