Wiktionary
interj. 1 (&lit you know English) 2 (context informal English) (non-gloss definition: Expression signifying a pause or hesitation.) 3 (context informal English) (non-gloss definition: Expression used to imply meaning, rather than say it, such as when a person is embarrassed.) 4 (context informal English) (non-gloss definition: Used as a rhetorical question to confirm agreement or understanding at the end of a statement.)
Usage examples of "you know".
Did you know that when it's refined it looks exactly like a heart attack and it won't show up in an autopsy unless the coroner is looking for it?
Shut up, we're talking too loud but anyone it was some dead white guy, they were sure of that, and they toasted dead white guys heartily during intermission when they stuffed themselves into a bathroom stall together and drank some bourbon they had snuck in and smoked some pot, yeah, right there at the symphony, well it beats working, you know?
If you've ever donated an aging PC to a friend or relative, you know what happens next: They need help, usually by long-distance.
If he was this prompt, maybe she should ask him about the webcam at 45th and Broadway itself, if there was anything odd about it or- Dear Friends, just to let you know I'm off for two weeks on the beach in Florida.