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. © 2015 Farlex, Inc, all rights reserved.

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 Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.