I have heard this expression many times. I think you all agree with this one.

It is used in many ways as in it has lots of meanings.

  • When you know something really
  • When you agree with someone about something
  • Expression of astonishment
  • Expression of sarcasm
  • Expression of exaggeration
  • And an excellent replacement for yes, no, please, sure, exactly…or anything

If you know it you know it!!!