Imihuasca is the creation of new molecules called imines, by combining an aldehyde and an amine/amide.
(More specifically, an aldimine is created, which is simply an imine which is derived from an aldehyde.)
Many aldehydes are highly reactive compounds. Some aldehydes are able to form adducts with amides or amines at room temperature without the need for a catalyst.
The word Imihuasca draws from the word ayahuasca which defines a mix of herbs in which DMT is made orally psychedelic by using enzyme inhibitors. The term Imihuasca was originally coined by the user 'Sativa' (the author)
Example reaction -
N-Benzylidene-N-phenethylamine is an aldimine (an imine which is derived from an aldehyde). It's found naturally in cocoa powders.
N-Benzylidene-N-phenethylamine is a natural adduct created from the alkaloid phenylethylamine and the aldehyde benzaldehyde found in cocoa powder.[1]
1. Ziegleder G, Stojacic E, Stumpf B.;
Occurrence of beta-phenylethylamine and its derivatives in cocoa and cocoa products; Fraunhofer-Institut für Lebensmitteltechnologie und Verpackung, München, Bundesrepublik Deutschland.; Z Lebensm Unters Forsch. 1992 Sep;195(3):235-8.; PubMed PMID: 1413998]