A Local term not found outside the Portobello area of Edinburgh Scotland, meaning the unscrewable bowl of a cannabis pipe screwed through an airtight hole in the centre of a plastic juice
bottle cap.
There have been examples of the same
principal being employed using an appropreatly sized socket set peice instead of of a
traditional bowl.
This alows a stoner to smoke a whole range of homemade devices whith ease and success, compared with the other option which is foil.
The term can also be applied however less acuratly, to describe the mouth peace of a (bong).