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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.
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