In the late 1940s and early 1950s, my father was a physics grad student at George Washington U. One of his professors was George Gamov. One time, a student gave an answer, and when Gamov just stared at him silently, the student asked "Isn't that right?". Gamov replied "Right?!? That isn't even wrong!"
This doesn't mean Gamov originated the quip. Gamov was one of the top physicists in the country. If it was being attributed, rightly or wrongly, to one of his peers, he would have heard about it. It could be he just used someone else's put-down. But use it he did.