Someone who smokes weed constantly and always seems to be producing joints and bowls out of nowhere, usually at the worst possible times. Generally has no sense of etiquette whatsoever about smoking weed.
"Want to get high?"
"You damn weed wizard, where did you even get that? This is an airplane!"
Somebody who goes about their everyday life pretending to have no association with drugs or more specifically marijuana, yet gives everyone the impression that they are a stoner.