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1.
The condition a person suffers from when their head is wedged firmly up their ass. It's a phenomenon that affects millions of people on a daily basis, and usually results in the person saying incoherant or completely retarded things.
Dave: Hey John, did you hear about Larry from across the hall?

John: No. What happened?

Dave: He told a nun that she needed to jam out with her clam out.

John: What a fucktard, he's got a bad case of headupassitis.
by talldude65 August 15, 2010