Have I got (something) for you!
A phrase used before one reveals something that is particularly exciting or surprising. Oh boy, have I got news for you—Becca's engaged! A: "Have I got something for you!" B: "Brownies! Yay, thank you!"
Have I got something for you!
Inf. I have something really exciting for you! (Said earnestly, before saying or showing something surprising or exciting.) Have I got something for you! Wait'll you hear about it! Have I got something for you! You're gonna love it.