psych · noun1
Clipping of psychiatry and psychology.
psych · noun2
Clipping of psychiatrist, psychoanalyst, and psychologist.
psych · verb3
Clipping of psychoanalyse.
psych · verb, interjection4
The verb is a clipping of psychologize. The interjection is probably derived from the verb.
psych · noun, verb5
The noun is a clipping of psychic (noun). The verb is a clipping of psychic (adjective) in psychic bid. It is attested slightly earlier than the noun.
psych · adjective, noun6
The adjective is a clipping of psychedelic (adjective). The noun is a clipping of psychedelic rock.
Etymology from Wiktionary, CC BY-SA 4.0.