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1.
Leader of the famed Merry Pranksters of the 60s psychedelic movement and main character in Tom Wolfe's Electric Kool-Aid Acid Test.
"Kesey walked into the room and everyone stood still."
by Stephen Mandel May 28, 2005
 
2.
A person who fails to accept commonly-accepted laws of reality, such as gravity and the police. Often associated with heavy LSD consumption, excessive use of Day-Glo paint, and frequent momirovs.
Without warning, the kesey leapt through the crack in the sky, sputtering multicolored paint upon the confounded constables below.
by Alex Momirov December 09, 2006