Weed Day

Etymology
From being slang for cannabis, and the number 420 being associated with the consumption of marijuana, with the date 4/20 being of similar pronunciation.

Noun

 * 1)  April 20th of any year, regarded informally as a time to celebrate marijuana consumption.

Synonyms

 * , 4/20, 4-20, 4,20, 4.20, 4:20, 4 20
 * , 4/20, 4-20, 4,20, 4.20, 4:20, 4 20