1. An experience of frightening feelings or hallucinations, especially as a result of taking a drug.
2. An experience or scene of unrestrained excitement or irrational behavior.
3. One having such an experience or participating in such a scene.

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.