purple smoke 

Touchstone phrase for situation when one person in a group suddenly notices something that the group has been focused on all along.

Origin: During a long street discussion of a massive fire in downtown Boston in the 1960s, another bystander suddenly said "Hey, look at that purple smoke!"

The group broke up laughing and repeating "purple smoke!". As isolated as the incident may have seemed, I have encountered the same phrase and meaning more than once years later as far away as California.

purple smoke by skribanr July 7, 2010

Smoke Dank Purple 

Smoke Dank Purple (or SDP for short) is a phrase shouted every 4:20, wether it be PM or AM, in an as loud and extra way as possible. This phrase Originated at 21st street Co-op in Austin and has been shouted there every day since the early 2000's. It can also be heard around the city of Austin on special occasions such as Eeyore's Birthday Party or 4/20.

Benny: " Hey, it's 420"
Ashley: "Ohh shit!"

Benny and Ashley: "SSSSSSMMMMOOOOOOOKKKKEEEEEEE DDDAAAAAAAANNNKKK PUUURRRPPPLLLEEEE!!!!!"
Everyone: "Smoke Dank Purple!"

Smoke Dank Purple by Trustcece May 22, 2019

Smoke that Purple 

To smoke Purple weed

I smoke that purple.

Smoke that Purple by Nigger in a Churchhouse December 22, 2012