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When your smoking bud and it gets to the point where it is almost all ash. It is considered "poo" or "poonaught" and is no longer smokable to normal people but is okay for fiends. Another way to know if its poonaught is by the taste after you hit it.

( This only happens while using bong, bubbler, etc. )
Jeffrey dont smoke that its poonaught!
by Eazyamo April 13, 2011