third lung 

a device used to smoke marijuana constructed by the following steps:

1. cutting off the bottom 5th of a 2 liter pop bottle.
2. line the inside of the bottle with a plastic bag and tape it to the outside of the bottle creating an air tight seal about 2 inches from the bottom of the bottle.
3. drill a hole in the cap and insert a small bowl peice(also make edge air tight; suggested to use thread seal tape)
4.fill the bowl, and light it while pulling the bag out from the bottom (thus filling the bag with smoke)
5 un-screw the cap and enjoy

we didnt have a peice so Curtis made another third lung and we smoked like champs

third lung by kyle toelken October 25, 2005

Third Lung 

The act of putting a deflated balloon into another person's anus and then inhaling and exhaling into it. The balloon will inflate and deflate, like a lung.

My girlfriend had a hard time sitting after I gave her a third lung.

Third Lung by AnusaurusRex April 29, 2015