What is the meaning of Psych?

Psychology or psychiatry.

A psychologist; a psychiatrist.

A psychiatric hospital; psychiatric treatment.

Psychedelic.

Psychiatric.

To put (someone) into a required psychological frame of mind (also psych up).

To intimidate (someone) emotionally or using psychology (also psych out).

To treat (someone) using psychoanalysis.

Indicating that one's preceding statement was false and that one has successfully fooled one's interlocutor.

An interjection of surprised happiness.

Source: wiktionary.org