Wait, a chiropractor's office? Could that be...
From 500 pages ago:
So, he was alleged to have choked and thrown around his child in the lobby of his sister-in-law's chiropractic office, and it's only been reported by the nanny? Nick should have kept his mouth shut; the more he spills, the more I'm leaning towards it probably did happen.
I suspect that he's specifically calling it a "chokeslam" because by framing it as a silly professional wrassling move, it's easier to paint as absurd and impossible.