It's a date!

It's a date!

informal An expression of agreement to the details of a scheduled meeting, such as the day, time, or location. A: "OK, so then let's meet again tomorrow at 9. Sound good?" B: "It's a date!"
Farlex Dictionary of Idioms.
See also:
  • how-d'ye-do
  • sweat
  • sweats
  • flow
  • nummers
  • yes, sirree
  • nummy
  • bottle
  • the bottle
  • carding