You Know Meaning
(informal) Used as a rhetorical question to confirm agreement or understanding at the end of a statement.
Example: Used other than as an idiom: see you,â€Ž know.
I donâ€™t usually get nervous in games and, you know, taking free kicks and penalties but thatâ€™s the first time Iâ€™ve been that nervous in, in a game, where I have to, Iâ€™m in a situation where Iâ€™m, you know... - BBC Interview with David Beckham 
A: I heard you want to do that thing with me.
B: Do what?
A: You know... umm...
B: Oh, do you mean sex?
A: Yeah... that.
But I guess that's life, you know?
I just wasn't into it, you know?