Hey everybody its National Stoner Day....I have the Munchies already National Weed Day - the meaning of 4 20 Unofficial National Weed Day is April 20, or 4/20. The meaning of 4 20: Four Twenty has come to be synonymous with pot smoking marijuana culture. Once a secret code for those in the know, 4 20 is becoming mainstream, part and parcel of the rallying cry being expressed by Americans everywhere: Free the Weed! 4 20 is a cultural meme, a unit of cultural transmission. Pot smokers celebrate the symbolic number. The term Four Twenty is a means to communicate with and identify fellow pot smokers. (Thats a big Ten Four )The twentieth day of the fourth month, April 20, has come to be a Stoner Holiday, a day for the celebration of the culture and identity surrounding marijuana.