I had a fiery exchange of words with a mate who doesn't speak English as his first language the other day over this. I asked him to translate into English what he meant by 'his bad', as it didn't make sense and wasn't a proper English sentence.
He told me it was, his English teacher (also not English as a first language) told him it was.
It got very heated
. My boss also uses it, it makes me want to stitch his mouth up.