Doing the bus driver

Smoking a joint (or even cigarette) without tapping the ash off it, resulting in a stick of ash in the smokers hand.

Orginated from bus drivers on their cigarette break, who for lack of time can often be seen smoking a whole cigarette without ashing once.

Guy 1: *passes a joint after smoking half of it without tapping the ash off*
Guy 2: Are you a bus driver dude?

Yesterday someone was doing the bus driver to me, i'm never smoking with that guy again!