To dream of karaoke is a demonstration of your overconfidence. You may be touting accomplishments or abilities more than you realize. Another meaning for karaoke in a dream is that you are not utilizing abilities or talents.
To dream of singing karaoke is an expression of joy at having recently found an outlet for your talents where they are appreciated. However, if you dream of trying to sing along to a karaoke machine but you can’t read the words, expect recent frustration to continue.