n. 60s slang: One who takes LSD or other psychedelics in a peaceful setting, as kind of a meditation aid. They hope to gain self-insight and to learn more about how they can live in harmony with God or the universe.
A place that marijuana brownies send you. A stronger mindtrip can be obtained by LSD, but brownies for these are harder to make.
See also the inner workings of the USA government, the inner meanings of Heart of Darkness, The Book of Relevations, any music by Jimi Hendrix, and any other mindblowing experience.
Note: drugs are not require to go on a mindtrip, but they help. All that is require is any concept that blow your mind.
We were discussing what the Book of Relevation actually means today in my religious studies class, but I ate some marijuana brownies right before class. Saint John sent me on an holy mindtrip today.