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1.
when a large amount of people are sitting in a small room smoking marijuana.
::someone walks in the room::"godamn you guys greenhoused the fuck outa here.
by nicker pease March 05, 2008
 
2.
to greenhouse:

to severely damage or wipe out a city or a region (spoken of a meteorological cataclysm associated with rapid climate change.

to be greenhoused :

to be severely damaged or wiped out by a meteorological cataclysm associated with rapid climate change.
New Orleans was greenhoused by that Katrina hurricane.
by Serge Chapkin September 02, 2005