Definition of "tripper" [trip•per]

• Slang One who is undergoing a hallucinatory experience induced by a psychedelic drug. (noun)
• A tripping or triggering device on a mechanism. (noun)
• Chiefly British One who is taking a short pleasure trip. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "* It went from bad to worse for the Jets "tripper," assistant coach Sal Alosi."
• "Surely, they were capable of enacting toward women, and toward one another, the terms of Martin Buber's I-It relation — Stevenson's "tripper" and the intimidating husbands offer the most intense expressions of that capacity, and no doubt, there were many subtle expressions of it at The Farm as well."
• "A single man's reputation as a "tripper" influenced the advice that married heavies like Mary Louise might give to him, or to a woman he might be courting."