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The most common case is when you wake up and have a massive boner that cannot be silenced. Other and more crucial times the boniferus luciferus can occur is when you're in P.E. class sitting during roll call and you be eyeing some girl. Suddenly the teacher will ask you to get up to play and you got a fat wood to show to the whole class. Signs of the satan boner are a 666 on your nuts.
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