you know

Short definition from Wiktionary

Interjection

1. 1
   Expression signifying a pause or hesitation.
2. 2
   Expression used to imply meaning, rather than say it, such as when a person is embarrassed.
3. 3
   Used as a rhetorical question to confirm agreement, knowing or understanding at the end of a statement.
4. 4
   Used to introduce information.
5. 5
   Used other than figuratively or idiomatically: see you, know.