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The sensation experienced when one sits down after a long day and experiences an erection due to how amazing sitting down feels. This may also be referred to as "chairousal" for females.
Girl: "Do you have a boner right now??"
Guy: "Well I haven't sat down all day and I'm exhausted! I've got a chairection because this couch is so comfortable!"
by squidwardinmypants1125 July 25, 2012
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