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1.
Tired, not in the mood, couldn't be fucked.

Man, I'm soo Birched I'm not going to come to the topless party.
by leglesslarry January 13, 2009
 
2.
The act of getting completely annihilated through drugs and alchohol.
Joe - "Hey Dan, what are you doin tonight?"
Dan - "Getting fuckin birched what do you think?!"
by bartholemue gustoffison April 12, 2010