An inverted Ffnord. The ffnord is used vertically with the bowl screwed onto the bottle's thread. The dronff is used horizontally with the toker sucking air (and smoke) from the top of the bottle, and the bowl is (normally crudely) inserted into the burned hole near the end of the bottle.
"Nah don't make a ffnordlid, have a dronff they're way easier to light".
