grammar

That's Grumpy and I'm flat out telling you (that).

or

That sounds grumpy and I'm flat-out telling you why.

That's Grumpy and me flat out telling you

An easy way of making sure you’ve chosen the right pronoun is to see whether the sentence reads properly if you remove the additional pronoun:

That's Grumpy and me flat out telling you.
That's me flat out telling you.

That's Dad and me in the picture.

Hey, mister, that's me up on the jukebox.

https://www.youtube.com/watch?v=jjiPr1jxVZ4

Hey mister, that's me up on the jukebox. I'm the one that's singing this sad song.
Well, I'll cry every time that you slip in one more dime
and let the boy sing the sad song one, one more time.

I'm flat out telling you that's grumpy

They didn't ask for a rewrite; the question was "which one is right?".

This is the result of a conversation in an unrelated discussion I butted in on,the original comment being
That's Grumpy and I flat out telling you the info is in the
EXIF data of the files.



>>> Grumpy and me.(my comment)
>>
>> What are you, a grammar Nazi now?
>
> Not a very good one. "Grumpy and I" is correct. If he's making a joke,
> I admit I can't see it.
>
'Snot correct,try that's grumpy flat out, then try, thats I flat out then try that's me flat out .(my comments again)

I will admit it is not a good example (my comment)

On Saturday, December 24, 2016 at 1:05:34 AM UTC+11, F Murtz wrote:
>
> 'Snot correct,try that's grumpy flat out, then try, thats I
> flat out then try that's me flat out .
>
> I will admit it is not a good example


This is the answer I got back supposedly proving that it is "I"

"I could explain to you why you're wrong, how it involves being the
subject of a verb etc, but let's be real. You're not going to admit
you are wrong, even if I did paint you the full picture.
Yeah **** the rules hey. Let's all talk like jonz."

so it does not look as If I could win as all the other posters agree that it should be I

Traditional grammarians think a linking verb, such as the verb to be, must be followed by the subjective form (I, he, she, we, they).

Based on that traditional rule, it is correct to say:

It is I.
It is we.

Having told you the traditional rule, common usage has long endorsed the objective form (me, her, him, us, them).

It is me.
It is us.

The Merriam-Webster Dictionary of English Usage says that it’s a style choice, and that “It is I” is a formal style and “It is me” is a more casual style. In fact, most people who write about language agree that unless you're answering the phone for the English department at the University of Chicago or responding to a Supreme Court judge, “That's me” is an acceptable answer.

So it was, Con, my apologies