1 definition by ITwitch

When you build unbelievable swelling in the tip of your penis after having sexual intercourse for a long period of time in a pool. The tip of your dick begins to look like the blunt end of a hammer while the rest of the shaft looks like a spaghetti noodle.
Man I had sex with her for 6 hours in my pool, when she left I had a hammer dick.
by ITwitch June 25, 2016
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