When smoking a bowl of marijuana, in the absence of a pipe screen, if the hole in the bowl is either too big, the weed is ground up too fine or a combination of both of those then there are proper precautions necessary to prevent getting shit on or scooby snacks if you're a queer. Many times you can take a big nug and compress it, and place it at the bottom of the bowl so it holds the shake while allowing airflow, hence the Nugscreen.
Ted: Man i got a little bit of bud, but this piece has a really big hole, and i lost my screen.. :(

Jeff: No problem, dawg we'll just nugscreen that junt.
by BedTundy September 22, 2011
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