420 friendly

[Becky]

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 Craigs 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

[Justin Bieber]

One who specifies and arranges a date with someone who is cool with pot smoking to the point of excluding those who do not condone the practice.