freak out

Meanings

Noun

• A positive experience with LSD or another psychedelic drug.

Verb

• To react (or cause to react) with extreme anger or fear to something to the extent that one loses one's composure or behaves irrationally.
• To scare or unnerve someone.

Origin

• From freak + out. 1960s countercultural slang, originally referring to a positive reaction or experience from the use of a psychotropic—usually hallucinogenic or psychedelic drug.