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The erection one receives that is instigated by the feeling of pure joy or excitement.
Ron got an instant joy boner when he found that his mates had organised front row tickets to the Lakers' game for his birthday
by kangoulius May 12, 2015
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A penile erection resulting from a feeling of pure happiness. The complete opposite of a fear boner.
After Dave witnessed the birth of his first son he was so overcome with happiness that he sprung a joy boner.
by DingDane January 02, 2018
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