I'm there

I'm there

A phrase used to accept one's invitation to something. A: "Want to come over for dinner on Tuesday night?" B: "Ooh, I'm there!" I'm there! Now, what can I bring?
See also: there
Farlex Dictionary of Idioms.

I’m there!

sent. I will accept your invitation and I will be there. If you and Tom are going to get together and watch the game, I’m there!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • address (one's) comments to (someone or something)
  • address comments or remarks to
  • address (one's) remarks to (someone or something)
  • be in it for
  • be shaking in (one's) shoes
  • be shaking in (one's) boots
  • be quaking in (one's) boots
  • be quaking in your boots
  • be out of (one's) head
  • be at a disadvantage