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The sudden, instantaneous onset of an erection without any apparent cause. Occurs in situations devoid of sexual impetus.

Also known as dickswell.
"I can't figure out why, but everytime I ride the train I get dickhard right before I have to get off."

"Im sorry Mrs. Applebottom, but I can't come up to the board and solve that math equation...I have dickhard."
by Elmer Pud April 15, 2009
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