from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. 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; originally, to suffer an unexpected and severe bad reaction from the recreational use of a psychotropic - usually hallucinogenic - drug,
- v. To scare someone.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. lose one's nerve
- n. a wild delusion (especially one induced by a hallucinogenic drug)
Coined in the Mothers of Invention album Freak Out. (Wiktionary)