delayed jinx
When one says a word or phrase 1 to 2 seconds after someone else said the word or phrase, without realizing the primary person said it; one could then call "delayed jinx".
Person 1: "Oh my gosh, it's sunny out!"
Person 2 at a 1 second delay: "Oh my gosh, it's sunny out!"
Person 1: "Delayed jinx!"
Person 2 at a 1 second delay: "Oh my gosh, it's sunny out!"
Person 1: "Delayed jinx!"