In the comedy show Premium Blend, there was a comedian named Dwayne Kenney. His act’s introduction was very catchy. Something like, "Yo... You know what I'm sayin'...?” His discussion after that was very funny and witty.
It's very funny that it made me realize that the expression, "You know...", can be very annoying. You know...
It breaks the thought. Why not just continue the fucking ellipsis and go on like knowing what you're saying.
It is for those who cannot put into words what they are thinking. You know...