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When your one's penis/erection extremely hard; sometimes to the degree that it hurts.
"I had a bad case of diamond dick, so I had to rub one out before it became a problem."
by Sam Majik December 18, 2019
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2
An extreme donkey punch; when having anal sex a man punches a woman to instigate the clenching of her anus. In this case the punches are particlarly brutal, causing the woman to clench so tightly that the man's penis is actually transformed to diamond.
She said she liked it rough, so I diamond dicked her until she lost a tooth.
by PAR April 26, 2006
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