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When the penis decides to erect itself and making it impossible to hide, resulting in the male adjusting to his elastic waste band. Although this tactic works sometimes the class boner counters this maneuver by making it obvious to the entire class what you're doing.
Girl: "hat are you doing"
Boy: "Just getting my phone out."
Girl: "lift your shirt up then"
Boy: "No....Why O.O"
*Girl lifts shirt up*
Girl: "Look everyone, he has a tiny class boner"
by SpitFireFuck October 10, 2013
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