A thumbprint is a method of consuming a massive amount of lsd, where a massive (relatively, compared to a blotter dose) amount of lsd crystals are made into a small pile, pressed on with a thumb, and then the thumb into the mouth.
A thumbprint is, despite the large dose is not at a high enough level to reach levels of toxitiy in the human body.
When's the last time you had enough lsd crystals to thumbprint, eh?
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