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.
used by a guy when he sees a really hot girl
Guy 1: "Dude, look at that hot ass girl!"
Guy 2: "Hell yeah, she's got some nice titties."
Guy 1: "Fuck me running, backwards, in a nun's dress."
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