The term 'marijuana, in modern slang' can be summarized by the crossword solution 'ENDO', which is an abbreviation for 'endocannabinoid'. Endocannabinoids are naturally occurring compounds found in the human body that interact with the endocannabinoid system, a network of receptors and neurotransmitters that regulate many physiological processes. Endocannabinoids are also found in marijuana, and when consumed, they interact with the endocannabinoid system to produce various effects.