to ingest Yohimbe or viagra or any erectile stimulant before sex in order to make the penis harder then it naturally is. Intercourse performed during hammer cock sessions should be very rough and performed almost in it's entirety in standing up doggie style. The complete act is referred to as hammer cock, or hammer time for short.
"Have you ever had hammer cock"? "yo, last night, I gave that chick hammer cock"!
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