Mods, I have a suggested answer for you. The screenname “yitayningwut” means, “You’re ta’ayning what?”. This expression would be used as a shocked reply when a chavrusa gives a krumer svora, and his partner asks what his ta’ana is.
If you are responding to his subtitle you are correct. We knew that, it was a joke at the time.[shout out in case you’re listening]