Ass Over Diddleberry

A saying, possibly from Georgia or nowhere, that expresses being completely blown off your feet, thus making your ass go over your diddleberry. Or whatever you imagine a diddleberry to be.

Person A: That Target Pizza made me go ass over diddleberry!
Person B: What? Diddle-what? That's not even a thing.
Person A: Yes it is! Everyone I know knows what it means.
Person B: I just Googled it and there's zero results.
Person A: *laughs maniacally*