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A contraption involving a plastic bottle with the bottom cut off, which is then placed into a larger container nearly filled with water. A "chillum" or "ratchet/rasche" - normally a ratchet socket with a gauze inserted - is placed into the neck of the bottle, and your chosen substance can now be stacked up & burned, whilst pulling the bottle out of the water, which fills the bottle with smoke due to the vacuum created. I have also heard this device described as an "Afghanistanian Gravity Bomb", but personally I think "bucket" is a bit catchier.
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