I See What You Did There Meaning

(informal) An expression used to point out that another person's joke has been understood, either to praise its cleverness or to clearly communicate a lack of amusement at it.

Example: Used other than as an idiom: see I,‎ see,‎ what,‎ you,‎ did,‎ there.
2010 November 4, Bill Prady, Steven Molaro & Steve Holland, "The Apology Insufficiency", episode 4-7 of The Big Bang Theory, 00:05:03-00:05:19:
  Leonard Hofstadter: Of course, we're in different departments. He's an engineer and I'm an experimental physicist. You know, one of guys who examines the building blocks of creation and says: "Hello, maker of the universe. I see what you did there. Good one."
2011, Grant R. Jeffrey & Alton L. Gansky, The Scroll, WaterBrook Press (2011), ISBN 9780307729262, page 103:
  "Wait. I see what you did there. You turned my comment around on me so that it would be an insult. You are one clever gal, Dr. Rodgers."
2011, "Fast chat: Miss Piggy of 'The Muppets'", Newsday, 19 November 2011:
  Oh, I see what you did there! You made a little "bacon" joke at moi's expense. You got a death wish or something, buster?!
For more examples of usage of this term, see Citations:I see what you did there.