Internet slang/sarcasm (acronym?): <something> if true!

I’m trying to remember if I’ve been seeing a phrase consistently, usually used sarcastically when a far-fetched claim is made, or maybe as a response to a dumb joke that involves exaggeration: “amazing if true!” or “whoa if true!”

Obviously, any adjective might work and it wouldn’t really matter when you’re spelling it out, but if it’s a somewhat common acronym (not sure if it is), you need to know the right word.

So my question is, is it a somewhat common acronym? If so, is it “WIT!” “AIT!” or something else?

Is this what you’re talking about?