you know, you know, you know, you know, you know...
... He says 'you know' a lot.
you know, it could be one of those speech vices, you know?
But in all seriousness, what I mean by that is that a lot of people that talk publicly that much don't want to say 'uhh...' or 'umm..' all the time, so they train themselves to say other words like 'you know.'