freak out

verb

cause to be freaky

Wiktionary

noun

Etymology: From freak + out. Countercultural slang, originally referring to a positive reaction or experience from the use of a psychotropic, usually a hallucinogenic or psychedelic drug. First use appears c. 1966 in several newspapers, particularly in the Independent (Long Beach, California).

A negative or unpleasant experience with LSD or another psychedelic drug.

verb

To react with extreme anger or fear, to the extent that one loses one's composure or behaves irrationally.
“When Peter saw the nail poking up through his foot, he freaked out and started hyperventilating.”
“Jimmy'll come in off the road, you won't be there, he'll freak out and call you a hundred thousand times...”
To scare or unnerve someone.
“Don't take off your shirt when working behind the counter. You'll freak the customers out.”
“Even the blithely unselfconscious Homer is more than a little freaked out by West’s private reverie, and encourages his spawn to move slowly away without making eye contact with the crazy man.”
To be upset or nervous; to be scared or unnerved.
To adopt an unconventional (especially countercultural) persona or appearance.
“On a personal level, Freaking Out is a process whereby an individual casts off outmoded and restricting standards of thinking, dress, and social etiquette in order to express CREATIVELY his relationship to his immediate environment and the social structure as a whole.”
“Formed in the heart of the British Invasion in 1964 as the Nevadas, the Jacks decided to freak out and grow their hair long.”