A term used to describe the high of heroin.. it is often mistaken as being very tired (which works out well for the user!), but it is more like "nodding" in and out of semi-consciousness. That's really the best way to describe it. It's like a series of times where the user will fall asleep for 30 seconds - a few minutes out of nowhere, and then suddenly snap into wakefulness again. They often are in very uncomfortable positions, too. (because they were not really planning or expecting to be sleeping!)..the term can also sometimes be heard with opiate-based pills, but generally it is specific for being high on heroin.
After shooting alot of H, i could see by the uncomfortable way he was sitting-with his head hanging all limp towards the ground- that he must be nodding off!
"Yesterday we did a few bags and after a few minutes, we were all nodding off."