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A boner that happens randomly and unexpectedly. Usually it is not a good thing. They generally tend to happen at the worst possible time or a time when it is not acceptable or called for. Sometimes it happens when a man is not even turned on or horney.
Man, it was weird. I was just sitting in math class and boom, random occuring boner. It made no sense, there wasn't even a hot girl in the room
by Tojo Hiroshita November 24, 2010
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