What does "unforgiveable" (??) Mean????

That we've just about run this horse ragged.

I posted on the other thread to hopefully, finally, lay this beast to rest.

I never meant to cause all this furore, I just thought it funny to point out a spelling error.

No malice was ever intended, and as the newcomer I will mould my responses to fit the arena in future, but still with maybe just a hint of Scottish sarcasm thrown in for good measure.

Cheers

Apparently it means you couldn't get the last word in the original discussion so you started a new one in the futile hope the others involved wouldn't notice it.