The mutual understanding between a marijuana dealer and his customer that each party has access to a scale, and as a result, all future transactions will reflect such knowledge.
When I noticed my first 1/8th I bought from Billy was a little short, I told him, and our weedweightionship has since improved as every sack since has either weighed out or been over.
The ability to recognize/detect the smell of weed anywhere or on anyone who has just been smoking it. Almost like the word "gaydar" but only with weed.
Damn!You late for work again and....whats that smell? Fuck man! my weedar went crazy when you walked into the room.