what does 420 mean dirty

The term "420" is associated with marijuana use and refers to April 20, a day to smoke marijuana). The term originated in California in the 1970s when a group of Northern California teenagers smoked cannabis every day at 4:20 pm). Word of the ritual spread and expanded to a yearly event in various places. Soon, cannabis aficionados were using "420" as a code for smoking and using it as a sign-off on flyers for concerts where the drug would be plentiful). The term is not a police code for someone smoking marijuana. Teenagers often use 420 as a replacement word for weed. Examples of how the term is used include "Do you have any 420?" and "It’s so foggy I feel like I’m in the park on 420".