"These kids I tell you" or "kids I tell you" expression meaning

I have read them in few disconnected articles and in conversations but could not understand them completely.

"These kids I tell you" or "kids I tell you" expression meaning.

What do they mean ?

To me "These kids I tell you" is the beginning of a complaint or compliment about "these kids" followed by the explanation of your complaint or compliment so your next words would be:

"These kids, I tell you, are driving me crazy!"

or

"These kids, I tell you, are very mature for their age."

The "I tell you" is added in as emphasis, but then the rest is dropped just to leave it open for interpretation.