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,‎ know.
  I don’t usually get nervous in games and, you know, taking free kicks and penalties but that’s the first time I’ve been that nervous in, in a game, where I have to, I’m in a situation where I’m, you know... - BBC Interview with David Beckham [1]
  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?