1. The time to get high as adopted by marijuana culture.
2. A way of mentioning marijuana in the presence of authority figures so as not to get caught.
Perhaps the most compelling source of 4:20 is the time of day an H.P. Lovecraft character cites for having become sober after succumbing to the intoxication of a "mirage-plant":
"I had encountered at least one of those curious mirage-plants about which so many of our men told stories. Anderson had warned me of them, and described their appearance very closely—the shaggy stalk, the spiky leaves, and the mottled blossoms whose gaseous dream-breeding exhalations penetrate every existing make of mask...Although everything was spinning perilously, I tried to start in the right direction and hack my way ahead. My route must have been far from straight, for it seemed hours before I was free of the mirage-plant's pervasive influence. Gradually the dancing lights began to disappear, and the shimmering spectral scenery began to assume the aspect of solidity. When I did get wholly clear I looked at my watch and was astonished to find that the time was only 4:20. Though eternities had seemed to pass, the whole experience could have consumed little more than a half-hour."
1. A loosely adhered-to marketing term used to refer to an adolescent to twentysomething male who shows off and makes a scene of himself. A mook personifies the adoption of trends for the sake of commercialism and the mindless celebration of childish masculinity. Particularly featured on mtv
2. That guy at your high school who used to be really popular when he was an underclassman, but now he sleeps with popular girls to get attention.