No.
I said it was "another of those weird American words that make little sense".
To break that down for you:
It is American in origin.
It doesn't make much sense.
The reason it doesn't make sense is that when someone is offended, insulted or whatever, it is not their arse that hurts. The arse is not the seat of emotions and feelings.
I hope that's cleared it up. Now if you'll excuse me, I have to go and do some grown-up things.