Top definition
When smoking marijuana, a piece of the nug is broken off and squished flat. It is then placed at the bottom of the bowl to block the shake from getting sucked through, while still providing airflow.

Maximizes your weed.

Another tip is (if you see a trail of smoke coming from the bowl) to cap it and cut off oxygen so the cherry stops burning. Otherwise extra THC is burnt off and wasted.

The carb must be blocked for non-water pipes.
Hey don't suck that shit through I don't have a natural screen.

I'm glad I read about natural screens on urban dictionary cuz it's been saving me lots of sticky.
by Ace of Chronic April 07, 2011
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