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.
Raising the front tire of a motorcycle off the ground, squids use this to determine the alpha male of a group of gixxer riders. The longer the whoolie is held the danker it is.
Dude did you seeGreg's dank whoolie? He held it for like two seconds! Fucking sick!