Jinx is a game, typically a schoolyard or children's game, with varying rules and penalties that occur when two people unintentionally speak the same word or phrase simultaneously.
[1][2] It can also be used to refer to the general phenomenon of uttering the same content at the same time.
A jinx can be initiated when at least two people say any same word or phrase at the same time.
[3] Typically, after the coincidental voicing of the same content, the individuals compete to say the word "jinx" before the other, with the slower respondent being the "loser" or "jinxee."
[4] In another, the winner will say, "Jinx, buy me a soda" or "pinch poke, you owe me a Coke" first and the loser must comply.