A drug indigenous to North America and is found growing on various people's foreheads. When licked, their foreheads give you the sense of being on Mars, or some other faraway place.
Jeff: "Whoa man, I feel like I'm floating..."
Me: "Lemme guess, you're on the forehead?"
Jeff: "You know it."
Me: "Lemme guess, you're on the forehead?"
Jeff: "You know it."
by dslogcob November 12, 2010
Get the On the foreheadmug.