I did not know what dysfluency is before I asked this question and got an answer.
Well, now I want a term for a special phrase or words that people keep on repeating when they speak. The most common words are
When I was a kid...you know... I was very shy. My father...you know...was an outspoken person. He always insisted me...you know...to be brave and straightforward...
The best example is here, a Sunder Pichai video. Worth noting that there's dysfluency as well!
I lost counting the number of 'you knows' in his speech! :)