This is a way to express the acceptance of smoking pot or accepting somone who does so, without overtly mentioning pot or marijuana.

You may find the phrase 420-friendly often in personal ads, especially on Craig's List.

It refers to the term 420 which has become lingo smoking pot.

See the definition of 420
"420 originated at San Rafael High School, in 1971, among a group of about a dozen pot-smoking wiseacres who called themselves the Waldos"

420 is the stoner’s holiday.
420 refers to April 20th, at 4:20, when stoners world wide blaze.

That date of 420 originated because 420 is the code cop’s use when they sited a large drug operation.

Everyonee is WRONG- 420 is the police code for a weed bust!

A cheat. Derived from,THE INDIAN PENAL CODE 420: Cheating and dishonestly inducing delivery of property
Whoever cheats and thereby dishonestly induces the person deceived to deliver any property to any person, or to make, alter or destroy the whole or any part of a valuable security, or anything which is signed or sealed, and which is capable of being converted into a valuable security, shall be punished with imprisonment of either description for a term which may extend to seven years, and shall also be liable to fine.

Used by ECW Wrestler (www.ecw.com) Rob Van Dam. RVD-420 means 'I Just Smoked Your Ass!'

An acquaintance who makes it possible for 420 to take place. Either being a 'middle-man' in the hook-up or building the actual spliff themselves.

420 is the national smoke out day. 420 can be traced to many places but i believe its from the Bob Dylan song Rainy Day Women #12&35. In the song he repeats everybody must get stoned. If you multiply 12 and 35 you get 420.