To hypothesize a situation so much, that it actually happens
Person 1:I bet the red team is gonna win this one.
Person 2: Don't speak into existence! The red team does nothing but win, they need to lose this one.
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When someone talks about something bad happening before it has actually occurred, thusly welcoming it to happen or in this case, speaking it into existence.
Jack: I’ve never been close to getting in a car accident.
Steve: Oh fuck, now you’ve spoke it into existence, something bad is bound to happen now. You should never be the guy that likes speaking it into existence.