(someone) hasn't seen nothing yet

(someone) hasn't seen nothing yet

Someone has only glimpsed or experienced the beginning of something that will become even more exciting, impressive, or important. (The word "ain't," a colloquial form of "hasn't" or "haven't," is often used instead.) I could tell your parents are already impressed with the house, but they haven't seen nothing yet! A: "Wow, there is so much going on in this city all at once!" B: "Just wait, darling, you haven't seen nothing yet—it only really comes alive at night!"
See also: nothing, seen, yet
Farlex Dictionary of Idioms.
See also:
  • (someone) ain't seen nothing yet
  • yet
  • you ain't seen nothing yet
  • You ain't seen nothing yet!
  • be larger than life
  • a stonker of a (something)
  • get (one's) hand in (something)
  • get your hand in
  • be in on the ground floor
  • come in on the ground floor