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1.
it is considered a verb amongst pot heads. it is a commonly used term in the united states, meaning a marijuanna smoke session.
hey man, what's up?

oh nothing really, wanna pine down?
yeah, sure bro.
by therealgabby July 21, 2011
 
2.
to b to get high by smoking weed
I'm finally off work, time to pinedown!
by missmarylawn July 21, 2010