Slang spelling for psych. Has the same definition and pronunciation.

A term used when saying something you don't really mean.
Example

A slang term (correctly, "psych") that was big in the 1990s. It's similar in usage to adding "not" to the end of a statement that's meant to be either sarcastic, a joke, or both.

The incorrect way to spell Psych (as in to psych out or psych up, or psyched).

Misspelling of slang term "psych", which is short for "psyched out". It can be used at the end of a statement intended to psychologically cause its recipient to be taken off guard or aback, hence allowing for a competitive advantage by the person using the statement. It is intended to be used, & then its success is to be pointed out publicly, as further source of creating an embarrassing competitive edge.

The immediately preceding statement is false and was told to mislead.

A misspelling of psych.