Psych (verb)

1. To manipulate or deceive someone in order to gain an advantage.
2. To mentally prepare oneself for an event or situation.

Origin:

Informal term, likely from psychology.

Examples:

1. He tried to psych out his opponents before the game.
2. She psychs herself up before every performance.
3. I don't want to psych you out, but this exam is going to be difficult.
4. He psychs out his opponents by acting confident.
5. He psychs himself out by thinking about all the things that could go wrong.