Today is April 20th, also known as 4/20 and for stoners it may as well be a religious holiday. Even if you don't smoke pot, when I say "420" you probably get the reference. But where did that number come from?

Getty Images

There are a lot of theories out there about just how 4/20 came to be. The most widely accepted is that it was created by five high school kids from San Rafael, California in 1971. The group of friends were known as "The Waldos", the name comes from a spot by a school wall where they would congregate.

According to Ryan Grim, author of This Is Your Country on Drugs: The Secret History of Getting High in America, the number "420" if a reference to the time that The Waldos would meet to try and track down an alleged secret weed field hidden in a nearby forest. According to legend, the crop belonged to a local Coast Guard member who could no longer tend to it.

They never found the field and eventually "420" changed from the time to begin searching to just a code word for anything weed related. The double meaning eventually began to spread from stoner to stoner and eventually the whole nation was in on "420".

Read more at Yahoo!