Talking To Yourself
noun
独り is when you're alone. 言 is when you say something. So, when you say something and you're alone, you're just talking to yourself.
The reading for 独り is just the reading for 独り. The reading for 言 is an exception, though. It's ごと, which comes from こと. Just think that as you're talking to yourself you're telling yourself over and over to go to hell. You're mean to yourself, and you're also insane, which is why you keep saying that out loud to nobody but you.
アイツは本当に独り言が多いよな。
He talks to himself very often, doesn't he?
カオルはブツブツ独り言をつぶやいていた。
Kaoru was muttering to herself.
母は、独り言を言ってるのを近所の人に聞かれて赤面した。
My mother blushed when neighbors heard her talking to herself.