It is a bastardization of a well known colloquialism
To a non US English speaker it would understandably sound strange
To English speakers who’ve heard it and have given it any thought, it just sounds careless, or stupid
If someone were to point out something like this to me, I’d just say “oops”, learn from it, and move on. I wouldn’t double down on it. It’s like defending ‘would of’, or ‘supposably’ - obvious mishearings of other words. People know what you mean; it is just that you are also telling them something you probably don’t mean to.