Room Bong

A room bong is the action getting high only by smelling all the belongings (particularly sheets) in a room in which weed is regularly smoked for a very long time.

Dude 1: *out of weed
Dude 1: hey man, I'm out of stock. You have some?
Dude 2: Nah dude, let's go to my place and do room bong.