Top Definition
The effects of marijuana usage that remain for a time after the high has worn off, such as forgetfulness, lack of motivation, apathy, and general emotional fucked-uppedness.

Not noticed so much in occasional users, but very obvious in those who buy Zig-Zags by the case.
Herbal Alzheimer's looks like Tommy Chong at his peak before his first weed of the day.
by da Graybeard August 06, 2009

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