I've never heard of that before...Would be cool as hell if there was an international thing for "i need/have weed" though. Imagine that...walkin' around town doing a certain motion over and over again and within' 30-60min someone will pick up and hook you up.

*Rubs leg with pant leg rolled up*
"Hey man...come over here, I think I got watcha' need"
"Thanks man, I was hopin' someone 'round here was holdin'"

your days of finding contacts would be over!