yaknow, like

Guilty as charged, Helen! I'm inclined to stick in "y'know" as a sort of filler word, too. But it isn't necessarily meaningless, despite the fact that there's no point in saying something the audience knows already.
I reckon "you know" actually means "I don't know".

Or maybe "you know" is somehow short for "Do you know what I mean?"

We're in a strange language land here, because uncertainties become certainties and questions become statements at the drop of a hat - y'know?