THIS is the read du jour for disqualifying Kavanaugh? That's just desperate.
No, actually, they aren't transparent lies. I've never heard either term used as slang before. If they have some commonly accepted meaning now, that doesn't mean that that's what Kavanaugh meant back then. It's entirely possible he meant something else, and was honest about what he meant by it. It's entirely possible that he's just unaware of the common current usage. Hell, it's entirely possible he was unaware of the common usage back then. As has been pointed out, that was pre-internet days. Slang was more fragmented.
I personally went for many years under a serious misapprehension about what OPP stood for. I no longer know where I got the wrong definition from, or whether I was deliberately or accidentally misinformed.