I don't have any native speakers around but I've seen it in chats enough times. I don't find this discussion productive anymore. You've again attempted at belittling everyone that doesn't agree with you and plugging your ears, seeing no need to provide evidence as to why you're right. Surprise surprise! You're the answerer and that's your job; to convince us. I'm moving along and having fun with my day instead of this useless argument. — PhMgBr 23 secs ago

@PhMgBr As I mentioned in the answer, the word whopping is an informal word. It is not broadly used. All right? Just because you can find some examples on the internet doesn't mean the indefinite article is absolutely necessary. How many times have you heard people say "whopping" in your life? Just because someone says he is a native speaker, he must be right? Is that your way of thinking? — Rathony 12 mins ago